Easy test:
Start the engine and let it run a bit.
Turn the key off.
If it still runs, remove the wire that goes from the coil to the distributor.
If the engine quits, you still have power going to the coil.
If it still runs, it is dieseling ("running on"). Cars back in the mod 70s would do this. I think it is usually caused by excessive carbon buildup. Something ends up getting hot enough to ignite the fuel/air mixture without a spark.
Start the engine and let it run a bit.
Turn the key off.
If it still runs, remove the wire that goes from the coil to the distributor.
If the engine quits, you still have power going to the coil.
If it still runs, it is dieseling ("running on"). Cars back in the mod 70s would do this. I think it is usually caused by excessive carbon buildup. Something ends up getting hot enough to ignite the fuel/air mixture without a spark.
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