1996 4.3 wont start untin you prime with gas then it runs great
4.3 what make? Priming with gas does what the choke should be doing, so my guess is that the choking system does not work.
Does your car have a carburettor or does it have fuel injection? There are 2 kinds of injection - via injectors or via manifold. These usually don't give hassles unless there is a problem with the temperature sensor.
If your car has a carburettor, it could be the automatic choke is not working properly. This is the little round gizmo attached to the side of the carb secured with a ring and three screws.
Take off the air cleaner, look into the venturi and take note of the position of the choke butterfly valve - that's the one mounted on a shaft that goes into the middle of the auto choke unit.
With the three screws loosened, not removed, slowly turn the outer cap and see what the butterfly does. Do this while the engine is cold. The butterfly should be just closed, maybe slightly on the open side. Now tighten the three screws on the pinch ring and that should fix your problem.
The auto choke has a bimetal spring inside that round plasticky thing that operates the choke butterfly. As hot gases from the exhaust heats up the spring, it opens the choke. Check that this spring, situated inside the round gizmo, is not broken.
Hope this helps.
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