quick history: my CEL keeps coming on since beginning of january. keeps throwing P0300 code (multiple cylinder misfire). so far they've replace an O2 sensor and both timing solenoids (all under warranty) and it came on AGAIN today. idle runs high (1000rpm-ish rather than the normal 650-700) when it's lit. other than that, i haven't noticed anything UNTIL TODAY:

driving home from the dealership this afternoon i took my foot off the accelerator to allow the car to slow on it's own before a gradual turn (i didn't brake). i was in 3rd gear at around 1200rpm. when i went to accelerate again the car hesitated noticeably 3-5 times before accelerating smoothly. after dinner i took it out again to see if i could replicate and it does. most noticeable in 3rd gear, getting more subtle in the higher gears. don't notice it in 2nd.

i know that's low rpm for 3rd gear, but it doesn't feel like the typical low-rpm shuddering or weak acceleration you get from being in too high a gear with too low rpm. it feels more like something slipping. could it be related to the CEL?

anyone with any thoughts? we're all getting frustrated trying to nail this issue down.

 

did you recently change out your stock intakes? if so you might have incorrectly installed your MAF sensors or got them dirty. IF not and they already checked your O2 sensors try cleaning you MAF sensors. There is a DIY posted somewhere here on it.

 

thanks for the suggestion. it's going back to the dealership this week so i'll tell them to try that. they cleared off the code and are calling infiniti tech to see what they suggest next (i was there pretty late in the day and without an appointment so all they did today was check the code).

i have no engine mods at all.

KEEP THE SUGGESTIONS COMING!! ...PLEASE!

 

Fuel injectors failing?

 

when you bring it back have them do head gasket seals! i had the same thing happen to my 08 and they did a complete tear down and rebuilt the heads... worth it since it ran for 120,000 miles lol

 

I would check the throttle bodies first like mentioned above. Dealer should be able to help out if its anything major assuming you're still under warranty.

 

head gaskets were replaced too about 3 weeks ago. forgot to mention that one.

thanks for the suggestion though!