I'm trying not to beat a dead horse, I have read a lot of the threads on this particular issue, and have followed a lot of the suggestions, still can't find the issue. Wondering if anyone with the same issue has actually found a solution.

2011 G37 Vert 106k miles. Here's what's going on:

1. Got SES light. Pulled code P0106. Cleaned MAF and MAP. Cleared code.
2. Decided it was time to do plugs and clean throttle body.
3. Did all 6 plugs and cleaned throttle body, reset ECU, did the 3 step process for Idle Air volume learning.

Now I'm getting sputter. Sputter at idle sometimes sputter when accelerating. We are talking about a 100ish rpm drop when at stop lights and sometimes even when accelerating on the interstate, etc. The rpm drop is accompanied by a shudder. Happens at cold start and warm stop, atmospheric and engine temp seems to make no difference.

What I have done: ECU Rest Idle Air Volume Learning procedure.
Spark plugs all correctly gaped
Checked intake boots and resonator for cracks, none found.
Removed and reinstalled plugs to make sure there was no issue there.
Checked throttle body gaskets, no issues.
Checked all electrical connectors, they are all full connected.
Cursory smoke test for other vacuum leaks, none found.

Could this be related to the maf/map sensor issue I had originally? after resetting the code, the SES light has not reappeared. Or is this related to the plugs or throttle body cleaning?

 

https://www.myg37.com/forums/d-i-y-i...oon-fault.html

Not sure if you saw this thread. But, did you clean your MAP sensor?

 

That's weird, I'm having the same issues since basically April 2022 when I took my G37xS Coupe (Red), it has 65K miles only. The issues seem to start after I brought it to my dealer and asked them to change my spark plugs...and they did a throttle body cleaning although I didn't ask them to do it. The car seemed to have trouble keeping its idle rpms. I changed the air filters. I have R2C intakes with air boxes and I installed a Dynamatt heat soak and sound shield cover inside my hood replacing the old one and the Dynamatt is about an inch thick and spongy. It presses against the fat rubber gaskets and prevent heat soak with air coming in from the car's original air conduits in the grill. Anyway I digress. The car kept getting worse. One morning in November we had to move the cars in the road to install our seasonal car shelter. When it was time to start the car, it didn't start for my wife. I thought it was something like maybe she didn't press far enough on the brake pedal to start it so when I went our it started fine. Then the following week I took it to the dealer and they didn't find anything. Then again the car's idle was not performing normally so I brought it back to the dealer (their prices are competitive up here in Montreal) and the redid the relearn and reset plus they cleaned the throttle bodies again. Then a week last while driving down to VA via central NY state and after encountering some bad weather the car got worse and went in to limp mode and the SES light went on. I did the pedal timing reset and probably ended up removing the code. Finally it drove nice for 10 hours. I took the Auto Train from VA to Orlando and drove from Orlando to Cape Coral which is another 3 hours and as I was arriving the damn SES light went on again. So I brought it in to my garage down here and pulled the codes: P0172. They did a reset/relearn after and it seemed to run fine for a few days then it would start acting up again. Then it threw another code: P0106 which is the MAF sensors. You need to change these in pairs. I but all my Infiniti parts from Z1 Motorsports out of Georgia. Their price for these are $211 ea plus shipping and tax. A week after they installed them and did all the relearn procedures, the car stalled while slowing down to a red light. I was able to control the car and brake with no issues and then I put it in park and restarted ok. The next day it went in to limp mode again. Then the garage removed the codes plus a few old ones and the car ran smooth for a whole week with no issues. I contacted a big well known tuner in Tamp called Z Fever as my car is also tuned with UpREV and they also tune with EKUTek so the tech there recommended that I do an induction smoke leak test and I also spoke with my tuner and he wasn't convinced and UpRev tech said to do the test too. So I made an appointment with a Nissan dealer not far and they found nothing. They performed all sorts of tests and found everything normal and didn't do the smoke test as they felt it not necessary. I was also told by the 2 tuners and the Uprev support tech that cleaning throttle bodies can cause issues if the cleaning agent was too agressive and removed the coating. So on the way back it went in to limp mode while driving back from the dealer. I did the 5 minute wait and restart and it was fine. Then at night the SES light went back on and I should've waited and gotten the code. Other code got last week when it died at the light was a P006a which is a MAP sensor error. However this could be caused by (drum roll please) the differences from the MAFs and MAP and not necessarily mean there's a problem with the MAP sensor. There are also other sensors on the car too: O2 sensors. However I'm starting to believe that the problem is a defective throttle bode=y or bodies. The disti now sells what Nissan now calls Nissan Select parts. The regular part costs like over $600 where as Nissan select is $195. Of course you need to figure out which one of the two is defective....good luck so change both. All the problems I've been having are consistent with issues that are common with defective TBs. There's also a TSB from Infiniti regarding this issue. I believe no matter what year the car is and even after the warranty, this is done free. However I will call Z Fever on Monday and see if they agree, talk to my dealer and they're going to ask the master tech on Monday too plus my tuner and if they agree I'll wait to bring the car back to Montreal in the spring and have the work done at my dealer. I will still buy the parts from Z1 and have them shipped. LMK what you guys think and if you had the same issues.