It idle okay.But once in a while after I use the car for a while (20 minutes or so) and the temperature is hot the idle of the car is kind of bogging little bit (every 5 or 6 seconds the exhaust make a liitle bang noise) seems like misfiring or something.But only when the engine is hot.When I have MSD SCI ignition is even worst,sometime the engine is shutdown when the temperature outside is hot and the load is heavy.But after I took MSD SCI off this the only problem I have.Anyone know what cause it?Thanks.