Question about Ford F-150
Not an expert on this. I wanted to give you a suggestion, I saw your post coming up a few times.
In my humble experiences with Fords (I own five), I have only had issues with the TFI Modules and the MAP sensor(s). My 89 Bronco had issues like your experiencing, hesitation rough idle, stalling. I removed the TFI and replaced it with an old module and the issue was solved.
Most of the modular engines from Ford now place the TFI Module on the "Distributor" or on the fender wall. If mounted to the wall it appears a lot like a computer, it is fined in the same fashion.
While I am not sure if this will solve your problem, it is worth a shot. Especially if you find that your TFI is blackend or shows signs of heat exposure or is worn in anyway. I have also been aware of an issue with the Mass Air Meter vane collecting junk and throwing off the stoich. This can be remedied usually by just spraying some starting fluid on the vane while the engine is off, allowing a short time to dry before kicking it over to avoid any kind of backfire or detonation.
Please seek a second opinion on this but as I said, I just wanted to help.
TFI, MAP, or the MAF.
Posted on Apr 22, 2009
Your idle is low.
Sometimes due to improper carb setting (you havent indicated the year).
Sometimes It is bad gas.
Sometimes it is failing alternator.
Please use the "Continue with this expert" option and reply with the year of your truck, the engine size, and if any warning lights are illuminated on your dash.
Posted on Apr 22, 2009
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Posted on Jan 02, 2017
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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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