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Re: 1995 buick jerks when you accelerate at 50-65 mph
Sounds like ignition wires are leaking spark. Open the hood, stand to the side, have someone hold the car in drive with one foot onto he brake and the other giving a controlled amount of gas. Hold the engine u at 2000 rpm, spray a mist of water onto he wires to the spark plugs. if the symptoms occur, this confirms the faulty ignition wires
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To start simple, have your tires rotated and balanced. Next, have someone mechanically inclined check your CV joints and wheel bearings. Sometimes this can be caused by transmission problems. But start simple-- it is cheaper.
I have this same car with exactly the same problem. Begins shaking at 40mph and stops shaking as soon as you let off the gas, but then begins again as soon as you press on the gas and smooths out as you get over 50. And the shaking is not felt through the steering wheel. Solution: Replace the transmission mounts. There are two of them, one on each side mounted on the frame right next to the shock strut. There is also a front and rear engine mount, but I replaced the two as described and shaking is gone.