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68gmsee · 05-20-2012, 10:40 PM

After you check what Wrenchbender said also check the timing and choke adjustment.

If all checks ok, get a couple of cans of good gas treatment to put in the gas tank. You may have a build up of carbon in the heads and it may take 2-3 tanks full with additive added to clean out. Took me about three tries but haven't had a recurrence since.

05-20-2012, 10:40 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Straight 6 250 sputtering after key is off After you check what Wrenchbender said also check the timing and choke adjustment. If all checks ok, get a couple of cans of good gas treatment to put in the gas tank. You may have a build up of carbon in the heads and it may take 2-3 tanks full with additive added to clean out. Took me about three tries but haven't had a recurrence since.