Originally Posted by
Nate007
My Camaro was doing the same thing and I found it to be the A/C compressor torque management settings. It would randomly pull timing and stumble and I beat my head against a wall trying to figure it out.
Add a box in your scanner for spark torque management. It'll tell you what is causing the change.
Are your hi and lo octane tables as well as the idle tables below them set the same? If not, try that while tuning to avoid chasing a moving target. Also, several others have talked about zero'ing out the burst knock tables, the VE prediction coefficients and other spark related torque management. I set mine to throttle only for some of the management settings, but it's still a tricky PIA finding these sometimes..
Good luck