1991 Cadillac Brougham

Computer problem
1991 Cadillac Brougham V8 Two Wheel Drive Automatic 66,000 miles

hi, I bought this car friday, the milage on it was 66,000, I started the car up on sat, today.
and the milage went up to 99.000 miles,
on the door it was last inspected in june was 58,000 miles. What happen? I purchased the car to resale, now what I have on the title r milage 66,000, now if I was to sale it they would say how did you put 30.000 miles on this car in a few months, and how would I explain this
September 20, 2008.

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