Question about 1998 Ford Expedition
First, check for loose vacuum lines and loose bolts on the intake manifold. If you get it running by holding the pedal, have someone use a spray water bottle and spray the seams on the intake manifold. A leak will change RPM or kill the engine. At that spot, tighten the bolts or replace the gasket.
There is a part called a Throttle Position Sensor. TPS It is on the drivers side of the metal Airhorn behind all of the plastic going to the Air cleaner. There are 2 screws and 1 electric connector for this part. The only trick to it after removing the 2 screws is when you put on the new part.
There is a small slot on the surface of the new part to match the shaft of the Butterfly flap in the Airhorn. Just make sure to get the slot and groove together properly before cinching down the mounting screws. While adjustment is possible it is usually not necessary. Usually the "check engine" light will come on with this defect.
Finally, it is possible that you have bad gas. You can help yourself by putting on a new fuel filter and running a little fuel into a glass jar. It will not take long to reveal itself. There are additives which can help it burn this fuel.
Posted on Jul 15, 2010
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Posted on Jan 02, 2017
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