I had the car out for a ride and after a few hard runs I didn't notice I had run out of alcohol until the knock gauge pegged to the limit!! I let of from a full boost tromp and hear a pop-pop-pop, thought I blew the head gaskets. Upon tear down NO blown head gaskets!! What else could have cause the pop noise I heard? It has a TA33c, bored throttle body, alky injection, 86/7 ignition, 3" DP, TT chip