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You could have a dead cylinder in the engine, or you could have a warped rotor, out of balance tires, etc.

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Q: Why would a 1991 Ford F-150 vibrate when you step on the gas pedal?
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Where would the brake light switch be on a 1992 Ford F150?

Under the dash near the brake pedal lever.


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Why would a 1991 ford f150 vibrate high speeds and when you let off gas it stops?

Sounds like a bad universal joint. The bearings in these frequently go bad and cause a vibration because the driveshaft can not move correctly. They "usually" are not too hard to replace in your driveway but driveshaft removal is required. They are available at any parts store and are relatively cheap.