3000 mi on rebuilt 4.9 E250 Exhaust gasket was bad,so I had it replaced.When I picked up the truck,it ran fine,but idled like a bucking bronc,when in gear at stop light. And just plain idled rough. It doesn't idle,and it runs down he road fine. It just idles bad. The tech cant figure it out. Before this repair,it idled fine. 1996
SOURCE: rough idle; engine light appeared
I had that problem with my 2005 FX4 turned out to be a coil on #6 cylinder I replaced the coil my self and the light went out coil was $58.00.These trucks are sensitive to water in the gas you may want to add gas line antifreeze or isopropyl alcohol to your gas every other tank to displace any water which may be getting in there.
SOURCE: truck runs rough
Sounds like one of your chambers isn't firing. Run your car for a few minutes, shut it off then pull your plugs one at a time and see if one of them is wet. Might just need a new plug.
SOURCE: ROugh idle
there are 2 things that usually cause this, one is a dirty intake idle control valve and the other is hard engine mounts, I would say that both most likely apply to your car. try cleaning the intake with the following procedure from Ford.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: 99 Expedition, runs rough, won't idle, no power.
it could be two things a bad injector or a the intake gaskets are leaking
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