ok so i just got a new toy an 86 notch with a 306 holley intake edelbrock heads n b303 cam so i was driving home on freeway n noticed a miss fire so i pulled over n took a peek thinking one of my spark plug wires is burnt out shure enough 2 were laying on the header so i get back in town buy new wires for the mean time n im still noticeing a miisfire and its making a poping almost like a fart noice out the exhaust im thinking plugs?