i had a problem like that with my 4.3 with the quadrajet now i had a PVC valve but im wondring if the carb is the problem, mine went through a rebuild which did little to help the problem cause the electric pump sensor ( not sure of its correct name) was the problem. I swapped out a different one and alls well now
hope that helps
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Bob
1951 International running on a squarebody chassis
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