Well I have switched my 04 comp G back to gas from e85. Something is very wrong and I can't figure it out. It has constantly high knock. At one point it pinned out at 14.9* and wouldn't change. There is knock at idle, cruise, and high throttle. There is no check engine light. it sputters at light throttle and seems to have power at full throttle. the opposite of what it was doing on e85. Before I switched to e85 the car ran perfect.
Here is what I tried and or replaced recently. the problem existed before and after these changes.
Put on brand new Delco stock injectors.
Put on autolite copper 104 copper plugs
Put on the 3.4 pulley.
I pulled the supercharger belt to see if the supercharger was causing knock and it was not. the knock was still there.
Any ideas of what I should look for?? I am at a loss. The car ran so good before I changed over. so something with the e85 messed something up
here is a scan from HPT.
https://www.dropbox.com/s/nojf71bo5p...20bad.hpl?dl=0