flywheel/flexplate or harmonic balancer? what about in neutral at a complete....
just saw in neutral at idle. miss fire on balancer or flywheel.. Get up under it, (engine off lol) check the balancer: see if the outer lip has moved on the inner part. Blalancer is two pieces with a piece of a strong durable rubber material. Some times it just gives out. When engine is running look for a wobble at the balancer