SouthArk370Z

It sounds to me like you are lugging the engine. Dropping down a gear and getting the RPMs up might help.

Might want to try a tank of high-octane gas. If the knocking stops, get your tune adjusted (or start using hi-octane fuel).

__________________
Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub
Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma