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helping a friend with his motor and we cant figure out why it Diesels so bad. as soon as you turn the key off, it continues to try and run. we changed fuel, tried a different carb, checked timing. He had someone tell him that due to his MSD system, that there is still power going to the coil which causes the run on.
I think is unspent fuel still in the cyinders.

could use some help here.



I did read somewhere that in some cases the MSD can cause this. There is some sort of device that can be used to prevent this.

Other causes could be as someone said, high idle speed, or the fuel not having enough octane, or too hot a plug.