Quote Originally Posted by Fast355 View Post
In that case you would want a manual trans engine tune to start. I would start with a 5.7L Manual calibration for a GTO or CTSV and copy the 5.3L engine settings into it.

When you said you harvested the engine from a donor vehicle, I assumed the transmission too.

There are some tuning guides that tell people to disable torque management and with a 4L60E it is one of the quickest ways to shred that transmissions. I did not want to see you blow one up following bad advice.
If I wind up having trouble with trying to run the stock tune I'll look into a tune that has a manual. I disabled everything to do with running checks for the transmission anyway. I have a pulse generator I'm going to bolt to the M20 so the pcm sees a signal of some sort so it doesn't stall when I let off the throttle while cruising.