[GLFarnes]

I have another old thread on this problem, but I think some of the info was misleading, so after a lot of messing around I'll try to describe this problem again.
This is a W (Vortec) engine and it is now tuned well with no codes. When the transmission (auto) is shifted from park or neutral to either drive or reverse about every third or forth time the engine will lose power and stall. I do not believe at this time that the problem is with the engine, but I may be wrong. Their seems to be a connection to the brakes at times but not sure. one thing that has been mentioned a few times to me is torque converter lock-up. I don't know that this fits the description. Another symptom is that the engine suddenly will surge up to 1500 RPM.

Any Ideas?

GL