Hello, First time making an attempt at tuning a 5.3 vortec and this thing is a mess. It has pacesetter 3" headers and 3" all the way back. No Cat and just a pass through muffler.

Extremely rich with stock file. Did some minor adjustments to the trq tables and turned off 02 sensors and now the thing runs worse then it did before. Extremely sluggish on initial throttle and creeps to 5000rpm to shift....

Any Ideas of what I may have missed or should be looking at?