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Re: 1983 C10 305 mind boggling engine problem
Sounds like its running lean to me. I would check the pick up in the tank. 30 year old truck, work vehicle could have collected enough rust/ dirt over the years to finally plug the thing enough. You can check the pump output by disconnecting the HEI wire and the fuel line at the carb and give it a crank to see how output is.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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