Question about 1991 Ford F150
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Posted on Jan 02, 2017
Replace the fuel filter as the fist action. Often this is charged for - but not done on a service, and if blocked will starve the engine. Just done mine after 3 years - would not believe the cr@p that was in it.
If not much difference, check the fuel pump in the tank, and any cables to it.
If this fails, the engine needs to **** the fuel more - and can lead to starvation problems too.
Change the air filter every year, as this is cheap and will give you better MPG anyway.
Posted on Jan 10, 2009
SOURCE: 91 F150 runs rough at low idle
If you put a scanner on it and you have no misfire codes I would be looking at either an egr valve stuck open a little or a bad Idle Air Control Valve
Posted on Aug 06, 2009
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