My 2wd 08 Sierra has been a good truck since I threw the DOD crap out and went to a BTR truck 2 cam. I recently added Texas Speed headers y and hooker maxflow but did not have the tune updated. No lights, my tuner tuned out the rear 02s. Since then the truck will fluctuate at light throttle in 3 and 4 and is mildly annoying. is this normal with my mods? Fluid is good 120,000 miles I've had it since 23,000 and was thinking the PWM might be screwy at light throttle.

Any thoughts, should I put a sonax kit in it and remove the PWM my tuner removed TM and increases shift firmness and faster shift

 

raise your lock up speed in the tune. i had a road i used to go to work and my truck would constantly lock and unlock. i raised the lock up mph like 10 mph and it stopped