Question about 1998 Ford F150 Regular Cab

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My 1998 Ford F-150 5.4L V8 shakes at idle.If im at a light the truck shakes bad and sounds like its dieing out and the rpms drop to around 500-600..if i keep the brake on and give it a little gas to around 1000-1100 rpm the shaking and dieing out goes away..I have replaced all the spark plugs..Any suggestions on what to try next??Thanks

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  • rlandaal May 12, 2009

    No there is no check engine light on..

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Usually that sounds like a bad spark plug wire. It could be one of the coil packs. I have the same truck and last year that happened to me. I went to Autozone and had them check it and it showed a bad #8 wire. By that most of my hair was pulled out. But it could also be a clogged fuel filter, just not all the way. I finally bought a meter so I can check my own codes. Do you have a "Check Engine" light on?

Posted on May 12, 2009

  • Dan Todd May 12, 2009

    You might try running a couple cans of fuel injector fluid through it. Check all your vacuum hoses too.

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Probably a manifold gasket leak, thats what myne was doin.

Posted on May 14, 2009

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