Ok tonight on the drive home from work my CEL comes on and im like wtf..... just had new exhaust put on today, cat removed and flowmaster 40 series put on (which sounds like pooo!) and then i get home and i check my codes and i get a 25.....idle air...blah whatever... so what should i do about this???

 

Take the IAC motor off and give it a good cleaning and reinstall.