I cant seem to find anything on how to fix my 2004 350z touring. It has 46k miles, only mods are Berk HFC's, invidia gemini dual catback, and aem long tube intake.
The problem was happening before any of the mods were put on.
It idles normal when cold. Then when it's warmed up it will stumble between 500 and 750rpms. Turning the a/c helps a lot but it's still there. I cleaned the maf sensor and did all the resets. I'm clueless?????

 

Do you have any codes?

 

survey says...............







probably didn't check

 

It had the check engine light on for the code P0171 but it hasn't been on the last 2 days and was never on before last week and this problem has been on going sense july.

 

The check engine light was on a week ago for code p0171 (went off the next day) but tht was the first time it ever came on and this problem has been on going sense I bought it in July