I have swapped the engine harness and ecm from an 07 Trailblazer to an 08. Should I have kept the 08 ecm and wrote the 07 tune to it? I used credits...
No EGR was +1 mpg on my 97 Express and a lot more part throttle torque. Fixed a bog off-idle that it always had from day 1. It hated the EGR because...
Ok; I appreciate the input. I?ve got it on the ragged edge with timing; 93 helps mpg by 1.5 or so when adjusted for it, but it?s not enough to offset...