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RPM's in Park can't come off idle (600-800rpm)? Could be plugged exhaust. How does the engine sound when you step on the accelerator pedal? What happens when you "floor it"?
If it starts misfiring, it could be a fuel restriction of some sort (fuel pump, filter, regulator) or an input sensor like the cam or crank. It's hard to tell with what you describe.
If it starts misfiring, it could be a fuel restriction of some sort (fuel pump, filter, regulator) or an input sensor like the cam or crank. It's hard to tell with what you describe.