hey guys i looked around and cant find anything exactly like this. so i replaced my spark plugs the other day and after everything ran fine i even drove about an hour and a half each way to visit my family and everything went fine but 2 days later my car started acting weird. ill start it up and start driving everything seems fine until i put it in neutral to coast to a red light and the engine will stall out on me. i start it back up and seems fine. but after it happens when i hit the gas and go into first it sputters for a second like it is going to stall.

i was thinking it could be a vacuum leak but i didnt see anything. also i have a exhaust leak that i just ordered a new part to fix it but i dont think that it would cause this. the same thing happened about 4 months ago but it went away when i turned the car on the next day it was fine so didnt think much of it. maybe im just missing something really small but i cant seem to find out whats wrong with it. its a 2004 touring model with 116,000 miles i have a couple of mods like a plemum spacer and a cold air intake but thats it. i dont have the stock intake it put back on and try it. also i had replaced the maf and both cam sensors a couple months ago so dont think thats it. im stumped so any help would be awesome thanks so much guys!

 

Why do you put the car in neutral to coast to a red light? Try leaving it in gear and see what happens.

 

that is what im doing now to prevent it from stalling but it still stalls sometimes. and its not running right

 

Almost positive it's the intake. Common problem on the Z. I am not sure how to fix it though but I am sure if you look on here you will find plenty of info on it.

 

It's probably getting the wrong amount of air. Do an ecu reset and the throttle position and idle air learning procedure

 

Crank pos sensor possibly too. There's a service bulletin about the Crank pos sensor causing this on some Z's.