Need Help
 

There is a popping sound coming from my exhaust. The car idles very rough. I was told that it was normal for an 01-03 GT for that to do that because of a sensor in the transmission from the mechanic. I believe that to be bull****. I also changed the spark plugs to see if it was a misfire because when i am in 5th gear the car bucks when i am driving on the highway and a lot when i open the throttle. If you think you know what the problem is please let me know. I also have an SLP loudmouth catback and a mac offroad midpipe. I higlhy doubt that the popping sound is because of mixture of exhausts but i though i would throw that out there too.

RE: Need Help
 

Sounds like this are impossible to diagnose without being there to hear them.
See if there are any codes stored in the memory and repost.

RE: Need Help
 

sounds like backfiring if you know what that is.. is it running correctly