I have a 1982 928S euro and i have recently changed the ignition wires and spark plugs. before i go into detail.... i know for SURE that the wires are in the right places... ok. so the engine was running fine before changing the ignition wires, but after i changed them, the engine runs REAL rough everywhere except idle. at idle it runs ok but only from the exhaust do i hear this noise that sounds like someone banging a plastic sprite bottle on concrete. if i rev the car, it will backfire. now i know it sounds like i screwed the wiring up but i know everything is where it should (except one wire....but thats on a different forum). please..... any ideas would make me griiiiiinnn.....