Question about 1998 Ford Ranger SuperCab

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Truck idles rough but at higher RPM runs fine. Checked codes and it is randomly misfiring on all cylinders. Also every now and then when changing gears revs up on its own and even at a stop engine revs up, i would have to put it in gear and slowly let the clutch out to lower the RPM to an average idle.

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  • Anonymous Aug 08, 2008

    I have a 1994 2.3 L engine that runs perfectly down the road and is smooth as can be. But when it idles it runs real rough and even dies sometimes. I changed spark plugs, fresh gas, new air filter, new crank sensor, new harmonic balancer and still have the same problem. any ideas?

  • harrisqa1 Oct 22, 2008

    iI have a 1999 Expedition wiht a 5.4 ltr engine. I've had this P0304 (cylyder 4 misfire. That was replace with new Coil Pack and Plug. After it was installed the Check Engine light came on again. I cleared it then. Truck still idles rough and loops. 1 Some say the EGR valve, 2. Vacum leake

  • RagginRanger Nov 10, 2008

    I also have a 91 Ford Ranger 4X4 standard with a surging problem while idling and surges between gear changing.

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Give it a complete tune-up, New spark plug and wire.new Ignition coil. Depending on the engine either replace ,Cap and rotors or coil packs.Also might want to get the fuel injectors service

Posted on Nov 17, 2008

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Sounds like either the EGR valve is leaking ( if it is it will be very hot), or you have a serious vacuum leak, take a can of carb spray, and spray around the intake manifold and see if the idle smooths out if it does you will need to repair the vacuum leak, it could be a vacuum hose or the intake itself leaking.

Posted on Jul 29, 2008

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