This been happening for while, I thought it was the coil so I replaced it with the msd and still got same problem. So I replaced the spark plugs got the ngk and still same problem. I will sit their and rev car up and the rpm meter will start going crazy when it hits past 3k rpms and you can hear like a backfire. It even happens when im driving and you can feel the car like jump, it does it only when im accelerating. Any idea's??