My 93 4cl camry. She runs smooth when idling, and can hit 3000-4000 rpm with shift on 'P'. But whenever shift to R or D, the engine shakes violently like punching, and rpm jump and drop frequently. No shaking on downhill road, but engine punches a lot on uphills, just like losing power. Anybody knows about this, I appreciate! She has 190k, with new fuel filter.