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do you know what the mileage is like on the car if it has been getting worse then it is probably burning a valve and it needs them replaced. If the mileage is not really changing it could just have the ignition timing set wrong.
Put a scratch mark on the distributor mount then loosen it and advance the timing a bit and see if it smooths out. If it doesn't then put it back to where it was. If the engine smooths out you should set the timing like it says under the hood to do it. I would probably advance it a degree or two past what it says though.
I would check to make sure the cam is getting oil first thing though.
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