Quote Originally Posted by roughneck427 View Post
I just dealt with this last week in EFI live it has a few spark tables
Maximum Spark Retard
Power Reduction MIN timing
Min final timing

John added them last week as i was having same issues.Ask for an update to that vdf all i did was change shift points and messed with these tables and it barks second gear most changes were to min final timing

Roughneck - Is the vehicle you are speaking of a 2009 4.8L? I just flashed it with the suggestions from those that made suggestions, along with some ideas of mine. Nothing changed the performance of the truck. It still will not spin the tires from a stop, with or without TCS on and AC off. I'm going to forward your suggestions to TC and see what he can come up with. Thanks for your input, everyone's input is appreciated.