Well my hi mile Bonne has a little blower knock in it, and on a side note the car has a bad loss of power climbing hills in 4th with TCC locked up. The more gas you give it, the more it stumbles and even in boost it won't pull a hill. Only when TCC is locked up though at 50+ MPH. Even at 75mph it won't climb hills without stumbling. Has anyone experienced the blower knock being picked up by the Knock sensor and making the computer pull timing? I haven't had time to confirm with the Tech 2 scanner that it is pulling timing, but it sure feels like it. What about a motor mount causing this?

I just called GM technical Assistance and they don't know anything.

It the SC knocking at idle or at drive speeds.?

Idle only I think.