Thanks Badger! Turns out that was exactly the problem. One of the Knock Sensor's had low voltage compared to the others. They removed it and cleaned the connections and i'm back to full power!! Just hoping nothing else goes wrong with the car now. Over $20k worth of bills in the past 2 years on this car ($10k from previous owner and $10k from me). This includes the $7000 I just spent on Timing and the $9000 tiptronic rebuild he did in 2013..........