Shaking Stayed 1988 Buick Park Avenue

1988 Buick Park AvenueI was looking at this car to buy it. When I went to drive the car, it was sitting in park at idle and I noticed a large amount of shaking. So I drove it up the road and the shaking stayed. I never drove over 35 mph. But I’d like to know whats causing the shaking before I consider buying it.


Most likely there is a misfire in the engine causing the shaking. May be as simple as just needing a good tune up or could a burnt valve. Hard to say without doing some diagnosing.