I just recently installed an 8lb lower on my truck with a gates belt and it seem that the truck shudders real bad when I punch it like either the belt is slipping or the motor is getting too much boost. I have a predator and installed the predator pulley tune but I don't have a custom burn for it. Can anyone tell me what is a matter with it? I need to have the truck in good shape before tonight to get to the track. I cant determine if it is belt slippage or the tune. I'm not used to forced induction setups and I could use any advice. Thanks you for your help and time.

HDog