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My 1978 ford f100 400 6cyl starts but when I come to a stop sign it wants to die. Sometimes it does it and sometimes it doesn't but most of the time it does. Is it the carburetor, the idle, the distributor cap, the fuel pump? What is it?
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In park or neutral not much load on the engine, when you put it in gear, there is a load. How may miles on the engine? How long since a tune-up? Any applicable trouble codes? Check and clean the idle air system and throttle body, see if it helps? Check cylinder compression. If the compression is way low, it may be tough trying to get it to run correctly.
In the old days, carbed engine, no computer, sometimes we'd set the idle in drive, at least it was driveable, it wouldn't die every time you stopped at a stop sign or red light. Yeah, when you put in park or neutral, the rpms would go high. Sometimes, your just trying to keep it on the road, if possible.
Using a smaller fuse should make the problem happen more often. A mechanic would unplug the pump harness at the tank and check the circuit for high resistance or a short to ground. If nothing is found in the harness, I would suspect the pump in the tank.
Float could be stuck, if it's carbureted or gasket under carb could be loose. Tighten and also put new filter in it. Could be bad injectors, if it's EFI which I doubt knowing the year. Could be choke setting wrong. I like manual choke myself. Try starting it with something holding choke open like a screwdriver handle. Something not too flammable.
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