okay after the track my car starting to act really funny every time i try to get on it at 4-5k rpm my car feel like it hitting boost cut and start miss firing.... i change out the plug to ngk 9 still no help and i try switching out spark wire no help ... anyone know what wrong with it.... i gonna try the rotor and cap 2morrow and see if that would stop it ... but any idea or suggestion is appreciated...........