Dave, Thanks for the dieseling suggestion. Sounds a bit complicated. I know the car isn't tuned perfectly and hope that has something to do with the dieseling. It did it during hot days of the summer. I does it sometimes when I rev the engine and then turn it off. If I let it idle for a little bit, and then shut it off, it usually doesn't diesel. I heard some recommend giving a flush with Seafoam gas additive to clear out the cylinders of buildup. After I get the distributor refurbished and the carbs tuned right I hope the dieseling will go away.
