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Hi Mitzi
Vibration is caused when you reach the particular harmonic frequency. At a certain speed.
Go past that harmonic and it disappears.
Usually by some rotating part.
A wheel. The tailshaft etc.
It's off centre or out of balance.
Lead weights on the wheel counteract this.
If not a wheel check the tail shaft.
if this issue is at low speed roughly five to ten mph it is a sign of a bad wheel bearing as the abs speed sensor reads off of a tone ring attached to the front bearings, when the bearing gets too much play it causes the sensor to receive an eratic signal making the on board computer activate the abs thinking the vehicle is sliding
Usually a vibration is due to one or more parts that have become worn or damaged. I'm not sure why you mentioned the tires but don't disregard them unless you know that they are fine. Check for correct inflation (on the door jam), for uneven tread wear, or bubbles and damage. Other things that can cause a vibration is the front-end needing an alignment, a tire that is unbalanced, worn out steering components (like a wheel-bearing), defective u-joints and/or an unbalanced drive-shaft, or low gear-oil level in the drive-axle can cause damage to the ring & pinion gear. The damage would primarily be on one side. So when you let off the gas pedal the sound goes away. Check as much as you can and let me know how it is going.
you may also want to consider that the coil pack is failing... i remember when my windstar coilpack failed i had an awful time just getting up a small hill... can't recall if it shuddered tho.
I know that this will sound Stupid. Change the Fuel Cap. If the Seal on the Gas Cap is Bad it will allow Air to get into the Fuel tank and cause your Rough Idle.
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