ok. so i have had my 3" turboback exhaust on for about a week now and ive noticed that the rpms on a cold start are very jumpy. hovering around 1500 then 1000 then back up to 1200 then down to 1000. when it finally settles, the car will go from 800 back up to 1000 and hold for a few seconds before dropping back to 800. this happens whenever i come to a stop and put it into neutral. PLEASE HELP. any suggestions?? ideas??

 

its because of your mods. mine did it before i got tuned.

 

ok thanks. that would make sense.