[drmonmf]

I am on second engine in my car. I mostly ran in s mode. I was having power loss when accelerating hard. Piston came out the bottom of the block. GM replaced every thing from supercharger to the cats. Second engine was still losing power on acceleration. Had it at dealer twice thinking it was traction control kicking in .
Srvs manger finally put his computer on it one nite and rode around with me while I ran the shit out it for several hours. He was seeing signs of detonation at different area's of acceleration.
The car finally acted up at 140 mph. The fuel pump flat lined.
He talked with GM and they have had problems with ECU and pin connector's. Had the fuel pump replaced and running fine since.