John,
For around $5, I'd get a can of SeaFoam and vacuum drag it through your brake
booster line to your cylinders. Let it soak there overnight before taking
another spirited run. If your run-on goes away, you got rid of carbon buildup
in the head that act as run-on hot spots (dieseling). If not, try different
fuel or you do indeed have sharp edges in your combustion chambers that require
rework. I don't think dieseling is nearly as harmful as it is embarassing. I
regularly use SeaFoam and think it is a great preventative.
Cheers.
Rick O.
72 TR6
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