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Q:

CAR STALLS WHILE DRIVING on 1991 Mercedes-Benz 560SEL

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
CAR WILL STALL WHILE DRIVING IF YOU LET UP ON THE GAS WILL RESTART AND KEEP RUNNING IF YOU KEEP THE RPM ABOVE 1800
(1) Answer
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It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. My first thought would be to look for vacuum leaks around the intake manifold and air induction boot. The Bosch K-jetronic system on that car is sensitive to water in the fuel, passage ways in the mechanical fuel system can easily get damaged internally. Although the type of injection system use on that car were used by other Mercedes, VW, Audi, Peugeot and Volvo a lot of younger fellows aren't used to working on K-jetronic fuel systems, best to find an independent Mercedes shop in your area familiar with those cars. Even younger guys at the dealership have never worked on these fuel systems.