> Monte Davrill wrote:
> >Cruzing back from Santa Cruz last Saturday, my '86 developed a vibration
> >that was hard to figure out. At between 50-55MPH a shaking (roughly the
> >frequency of the revolving tires) takes place when I'm on the gas but stops
> >instantly when I let off the pedal. This happens on level roads and hills
> >and only in the above noted speed ranges.

Could be one of the wheel balancing Lead tabs came off one of your tires.

Chris