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I have a 71 gmc 350 engine. It diesels when I shut it off. What causes this? The engine runs good, maybe a little rich, has 154,000 miles, does not leak oil or smoke.
 

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Most of the time it's because the throttle plate in the carb is not fully closing. Turn back on the idle screw and make sure the throttle plate is closed. You may then need to adjust your idle air adjustments on the front of the carb to get your idle speed back.
 
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