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Idle surging, up and down…
More often than not, the idle will move up and down a bit when I restart the truck after it has been warmed up and driven. Then, after about a minute or two, it goes away. It’s a straight six, 292, carbureted. It just started doing this recently.
Could it have something to do with the fuel pickup in the tank?
Vacuum leak - if so, why would it go away? Vacuum leaks don’t fix themselves.
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1963 C20, small window, long bed
292, 4-speed
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