hey guys i picked this lude for 300 bucks, the guy said it needed plugs and wires, well i changed them out only to find it still ran like crap, I just got the timing perfect because it was off a tooth and it still runs bad, but the problem is only intermittent. Somtimes it will run good at idle then the second you give it gas it sputters and backfires. What could cause this. bad o2 sensor or what??? please help me out asap
thanks