1998 Ford Expedition is it a miss??

1998 FORD EXPEDITION
175,000 MILES • V8 • 4WD • AUTOMATIC
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[email protected]
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when the rpms get to around 1300-1600, the engines feels like it has a terrible miss. below that range or above it...it is not that bad at all, sometimes not even noticeable. I have changed plugs and even a couple of coil packs that looked like they might be bad, but it hasn't helped at all.
Feb 22, 2010 at 10:52 PM
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RASMATAZ
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Hi [email protected], Welcome to 2carpros and TY for the donation

Your probable causes-Inspect and test all the following listed below:

Oxygen sensors.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Fouled/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.
Feb 22, 2010 at 11:35 PM
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[email protected]
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Kinda generic answer isn't it? Not much help.... :(
Feb 23, 2010 at 10:20 AM
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RASMATAZ
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One of this components will cause your problem I suggest you check it top to bottom and get back with some testing results so that we can continue, remember were not there with the vehicle your my eyes here-Misfires can be hard to deal with-could be compression/fuel or spark problem
Feb 23, 2010 at 1:23 PM