Assuming that the bad fuel has been cleaned away, check the fuel filter, air cleaner, and muffler for plugging. Turn both jet screws CW to stops (lightly) then back out CCW 1-1/2 turns each. This is a basic setting which should allow the engine to start and warm up. After warm, pull the throttle full on and turn the H jet needle CW until the engine starts to speed up. Final adjustment is when the engine 4-strokes at speed unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L jet needle CW until the engine idles fairly well, but still allows the engine to 'follow the throttle'. Hope this helps!
The missing while accelerating is likely due to ignition coils and/or spark plugs going bad. The missing while in park is a normal thing. The car has a rev limiter that will not allow the engine to rev to higher than 3000 RPM while in park.
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