Hello guys.
So my car would just sputter and die when im at a light or at a full stop. I would turn it on again and it would just die again so i would sometimes have to hold on to my gas pedal for my car to stay alive. Then sometimes when im on the highway going 70mph the car starts to struggle like the acceleration wants to cut off so it would shake my car but it doesnt die. I have a 09 G37S Coupe 6MT, my check engine light does not come on and i have 81k miles

So far this is what I've done
-Clean intake filters and pipes (Stillen Gen3)
-Changed to new MAF Sensor
-Cleaned TB
-Seafoamed (oil,brake booster, gas tank) Now waiting on oil change after 100miles
-Changed sparks and coil packs

After doing those procedures my car would still die on me.
Anyone else know whats the possible issue?

 

Check the voltage on the battery and go from there. Mine started doing that little by little until it died on me and went on limo mode on me

 

i got the battery replace with an OEM one 4 months ago.

BUMP anyone else?

 

possible fuel delivery.. check your fuel pump

 

After cleaning rhe various intakeparts, did you do a pedal position, throttle position and idle air volume relearn?

Have you checked for vacuum leaks?

 

Fuel pump might not be seeing right pressure

 

ck fuel pressure. ck for vacuum leaks.

 

On the nicoclub forum in the g35/37 sub forum there is a thread on the first page of two guys going through the same thing on their 07 G35. They don't have a solution yet but it might be helpful to get on the same page with them if someone finds the solution.

 

Possible to double check for vacuum leak?

Engine stalls on deceleration ?!?! Anyone else had this problem ? - G35Driver

Look at post #9 and below

 

ECU and throttle relearn
Then move on to the fuel components