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Q:

please help me out love this car on 1992 Mercedes-Benz 300SD

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when i put the car in reverse the engine revs up and jerks in to reverse. also the ac or heat wnt blow out the vents
(1) Answer
Honestly it sounds like you need a transmission. You can either get a used one from a junkyard or have yours rebuilt