ok guys. Before i got my cat. replaced my car would chug while accelerating. then i went to a straight pipe and it didn't chug at all and ran really well...just loud. now i have a high-flow cat. and its back to chugging. any ideas on what could be the problem? just cat. new fuel pump and new fuel filter. could my injectors be going bad or something?

 

You can try unplugging wach injector one at a time. If the idle doesn't change, then you have a bad/clogged injector.

 

if i unpluged the injector wouldn't the idle change anyways since it would only be running on 3 cyl.?

 

If you unplug a good one, you will hear the idle change....indicating that is is a good one. If you don't get an idle change, then that injector is bad.

 

oh ok got it now thanks i'll do that tomorrow. Should i check anything else tomorrow as well? something thats easy to check.