need help
 

07 tbss stock, at low throttle it's good but past half throttle not so good and at times falls flat on it's face . Not always ?? Have a super chips tuner tried different tunes with it ...same , don't know what's going on ?? Had the gm dealer flash the computer to stock thinking it was tuned for a power adder or something, still does it ??? Help please tks

That still doesn't give us much to go off of.

Is it misfiring and coughing when you get into it?

Are you sure the cat converter aren't plugged up and not allowing exhaust gases to move freely?

Superchips tuners are kind of worthless to me, they don't provide very good tunes because it's just a copy paste method the company makes for everyone and not every vehicle is the same or reacts the same to those tunes.


I'd need to view a data log to see exactly what is going on but superchips can't give you that.