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Old 04-05-2014, 07:30 PM   #1
Guerrero707
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77 GMC carb problems

I ve been having some problems with my truck, i haven't moved it in about 2 months but sometimes when i start it, the choke warms up so i give it a little gas and a few seconds later it shuts off and i cant start it back up. also sometimes if i give it gas too fast it shuts off and sometimes its fine it wont shut off no matter how fast you press the accelerator. please someone help i need a solution to whats wrong with it.
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Old 04-05-2014, 08:25 PM   #2
geezer#99
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Re: 77 GMC carb problems

Take some pics front and both sides.
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Old 04-05-2014, 09:23 PM   #3
MikeB
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Re: 77 GMC carb problems

Does it run OK when it warms up?

Does choke close when the engine is cold, and then gradually open?
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1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes.
1982 C10 SWB -- sold
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1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming.
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Old 04-05-2014, 09:46 PM   #4
Guerrero707
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Re: 77 GMC carb problems

It sometimes runs fine but most of the times i cant even get it out of the garage because it shuts off when i put it in drive or give it gas to fast.
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Old 04-07-2014, 07:33 AM   #5
motornut
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Re: 77 GMC carb problems

I had issues with the backflow valve in my 79 carb,it would come out of place and block the flow,kinda like you describe....

http://67-72chevytrucks.com/vboard/s...d.php?t=579621
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