Straight 6 250 sputtering after key is off

[factoryorange3]

I have a 84 c10 with a 250 inline 6. Single barel carb. After truck is warm I shut the key off and the truck continues to sputter/pop for another 5-10 secconds. Anyone know what might be going on?? Thanks,Be njn
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[Wrenchbender Ret]

Its usually caused by the idle speed to fast. Also can be from a vacuum leak. Some of those used a selinoid on the throttle to drop it back when you shut it down.

[68gmsee]

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.

[Gumby]

Has the truck always done this?

Or is this a new problem in recent weeks?

Is it a new problem after installing an elecric fan, radio....?

[factoryorange3]

Recently. The head is rebuilt and it may be a timing issue as a result of truck being slammed off a curb due to a near missed car accident. Maybe distributor spun alittle.
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