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.
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What would cause a motor to Diesel when turned off?