hey guys, i have Razor's single nozzle kit on the car in my combo. it has a TT chip for alky with 23/21 degrees. Russ Merritt set up the car,and did all the work. the car ran awsome 25-26 psi and the most knock i ever saw was 1.2 degrees. anyway i went out last saturday night and filled up the tank and went looking for trouble. i got on the car and was knocking very badly. it ran perfect the day before. the only things i can think of was it colder than it had been, 49 degrees and 81% humidity. the gain was all the way up on the control but tons of pinging, saw up to 8 degrees and could hear it ping. cold air needs more alky? maybe bad gas?