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did you have this problem before you rebuilt it.
i assume the carb sat for a while and it was gummed up pretty bad.
thats about the time the secondary opens up. is the secondary plate free? the way to check the secondary without driving the truck, is take a rag and restrict the primary while revving the engine. the secondary will open and the engine still run. restricting the primary is to keep the engine from over speeding. hold the engine about 2500-3000 cup the rag over the primary and increase the rpm. if the secondary is working it will continue to run. caution!!! don't do this very long. you should be able to tell fairly quickly
does this carb have an internal power valve or is it vacuum. did you go through the jets again.
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