Hey guys...i need your help.

At steady speeds usually around 40mph or 62 mph roughly, my gsr sorta hesitates, and then picks up right away.

The clutch was just replaced with a CC stage 4, and has been running good until i switched my exhaust out. I was running a stock gsr b pipe to an ITR axleback. I took that off and put on a Thermal 3 inch with a hi flow 2.5 in/ 3 inch outlet catalytic converter. Thats when the hesitation started.

Last night i took the Thermal off to sell it, and i had to drive open cat to go home. I noticed that the hesitation was still there.

I was reading up on it, and it says to check the IACV and clean the TB, but is there anything else that can be the problem. Injectors maybe? fuel system or anything of that sort.

Any help would be greatly appreciated. Thanks in advance.

 

BTW the car has a new primary o2 sensor. I knew it was going bad, so i replaced it in hopes of getting rid of the hesitation at cruising speeds but nothing....its still there.