Rough idle fix?
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1st Gear
Joined: Jul 2025
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Rough idle fix?
Hello everyone, I have a 1994 f-150 xl 4.9 5spd that has a stumble on idle. Doesn't matter if it's cold or hot. There's also an intermittent issue where it runs TERRIBLE, like it's starving for fuel or something. A quick "fix" i discovered for that (out of frustration) is to rev the thing up around 4500-5000 rpm and it just settles down but still stumbles. I have no idea.
I've replaced the distributor, plugs, wires and fuel injector harness (it was eaten by mice) I've checked all vacuum lines and done a smoke test and found no leaks. I've also checked all the wiring under the hood, nothing is frayed or unpinned from a connector. Any help is appreciated thanks in advance.
I've replaced the distributor, plugs, wires and fuel injector harness (it was eaten by mice) I've checked all vacuum lines and done a smoke test and found no leaks. I've also checked all the wiring under the hood, nothing is frayed or unpinned from a connector. Any help is appreciated thanks in advance.
FTE Community Team
Joined: Jan 2019
Posts: 10,781
Likes: 1,512
Might want to start a new thread in the 1987 - 1996 F150 & Larger F-Series Trucks forum. They'll be able to help you out.
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