2003 Kia Optima

Other Category problem
2003 Kia Optima 6 cyl Front Wheel Drive Automatic 129000 miles

Driving down the road today my car began to vibrate and shake, if I let off of the gas, it would stop, but anytime I got above about 60 miles an hour it would start again. Tried fuel injector cleaner thinking it was the injectors messing up, nothing.

What could this be, or maybe I should say, what could this cost to fix? I am out of town in another state, eeeks!
December 15, 2007.

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