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Best advice I can give with what experience I have. Give it a good tune-up, change all the fluids and run a can of sea foam in the gas tank. After all that find a local rotary mechanic or purchase a rotary compression tester from a vendor on this forum and check your compression. Also look to see if the car still has its converts on it, @ operating temp if they are glowing red you need to gut them or replace them, could be part of your performance problem.
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