ok so since i installed the long tubes and changed the plugs and wires, i have what sounds like a backfire and loss of power when i get on it from time to time. i figure maybe the plugs are gapped wrong and im misfiring but im not sure.. anyone have this problem before? it only does it when im to the floor and not every time i punch it. just 25% of the time. it does every time it shifts into 2nd between gears i guess too.