I have been driving an 83 D150 slant since Feb 2014. Just recently idle speed dropped and began getting sluggish and stalling when warm. Believe carb is holley 1945 1bl. Fuel/air screw missing and cant figure out if that is the only prob. When stalls, seems like its choking itself out. Also has a lot of run-on (dieseling effect) not sure what else to do besides rebuild. Don't know settings for carb.

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Navy Vet

Does it have the lean burn stuff still on it?

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Are you sure it isn't just hidden behind the factory concealment plug?
Dieseling is usually a timing problem.

I second the question "Does it have the lean burn stuff still on it?" A failed lean burn system can cause exactly the symptoms you describe.

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Casually looking for a Clifford hyperpak intake for cheap.

Positive. The idle mixture screw and cap are not present. Not sure what size. been driving it since Feb and had occasional run-on but now more so. Distributer is tight (hadn't been touched)

When truck runs for about 10 minutes it sputters out and is hard to start. must sit b4 starting again

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Navy Vet