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Help starting my c20

The 1967 - 1972 Chevrolet & GMC Pickups Message Board - The 1947 - Present Chevrolet & GMC Truck Message Board Network - 67-72chevytrucks.com
Long story short i got a new Jet carb to replace my old warped Quadrajet. Once i installed it the truck will fire up and die in about 2 seconds. If i hold the throttle down a decent amount it will stay on but once i go lower or let go it just dies. I replaced the fuel pump as well and still the same. I screwed the adjustment needles in and back out to match the old carbs setting and still nothing. Can anyone give some advice on what to check or adjust? Like i said with the old carb it would run fine just leaked fuel all over lol but with the new one i can?t keep the damn thing running.

?70 C20 Longhorn

Factory 402


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