Re: 250 straight six starving?
I had an issue similar to this recently. I have a manual choke and it would run fine with the choke pulled out about 3/4, but with the choke pushed in it would hesitate and backfire through the carb. I could not find a vacuum leak anywhere on the intake or carb,
so I pulled the pcv valve hose off and plugged it and it ran better. So I replaced the pcv valve and now it runs fine. You might check your pcv valve also, could be a vacuum leak there.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast"
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2015 Silverado 1500 LS 4.3/6L80/3.23
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