It has new plugs, wire distributor and fresh oil and gas. I have sprayed cleaner in the carbs and added a fuel system cleaner.
Fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.
SOURCE: Fuel system
fuel pump? carb? or throttle body? if injected the fuel rail should have a test point it will look kinda like a tire valve may have 15-40 psi under it auto places like auto zone and others rent kits for testing turn key forward listen to hear the pump in tank if injected push the valve in with a pen possible but becareful not to get in the way of gas use rag to catch it if nothing comes out most likely fuel pump but you will have to try to start the vehicle before attempting this raw check as line pressure falls off naturely in 10 min or so
SOURCE: 1994 Yukon running rich and flooding
Fuel pump circuit (low voltage)
Try replacing the fuel pump relay or testing it if you have the manual.
SOURCE: I have a 1985 GMC C1500 Pickup. It has a Chevy
Your carb needs rebuilt, the float is to high or just really crapped up inside. You are dumping fuel in. Lee
SOURCE: 96 gmc vortec will not start
I AM LOOKING AT TIMING ISSUES OR INTAKE MANIFOLD LEAK.OR EGR VALVE STUCK OPEN.
SOURCE: My 1993 GMC Sierra wont start it will turn over
sounds like you have a bad fuel pump which is in the fuel tank
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