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engine problems on 1992 Buick Roadmaster

what does it mean when the engine jerks when i go over 45

Could mean an engine misfire, transmission issue or possibly something else entirely. These types of problems require experiencing the problem to better understand what is happening. I suggest you find a mechanic and have them go for a test drive, see what they say.
Just fixed that problem. After changing plugs and wires it turned out to be the distributer behind the water pump.
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i put spark puls and wires now the car will not crank up it want to but are not