I just finished installing an amp and a sub and I went to start the car up today and it idles like CRAP!, does fine if i hold the idle up myself with the gas and it does fine once it gets goin, any ideas what the issue is?? I'm more familiar with carbureted engines so I aint real familiar with the works of fuel injection so any help is appreciated.

 

If you disconnected the battery at any time, you may have erased any adaptations the ECU has learned - including fuel trims and idle speed. You'll need to drive it to give the ECU time to relearn these adaptations. As far as stalling- keep all of the accessories off and let it sit and idle. Eventually, it will smooth out.

JJ