I quess if I had a good hill to go down I could of got it over 4G's but I'am not sure. Really though it had no power and would not rev up. With the engine off I then pulled the 4 sparkplug wirers loose from the dist cap and just let them sit loose in the holes. This allowed the spark to still make contact and allowed them to be pulled off easily. I then started the car and with insulated pliers "and a leather glove" I pulled 1 wire at a time away from the dist.cap. If you have a bad plug when you pull that connecting wire you won't notice any or very little engine RPM change. Pull either of the leading plug wirers first cause they do most of the firing of the fuel.If you have a bad plug this will show which one. Make sure you protect your hand or have a friend try it first. Good luck