Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi, my name is***** common cause of stalling on this model is a bad distributor cap and rotor or a bad ignition coil or crankshaft position sensor. Another possibility would be a bad idle control valve. I need more information from you in order to point you in the right direction. What happens after it stalls? Does it start right back up? If you keep your foot on the gas pedal and raise the rpm a little bit will it still stall?
If you cannot start the car for 20 minutes after it stalls you need to test for spark and test the fuel pressure when it won't start. You can also remove the air cleaner and spray a little ether into the air intake while a helper cranks the motor and see if it will fire or will run on the ether. If it does it would indicate a fuel problem and not an ignition problem.
If it tries to start after it stalls it sounds like you are losing fuel pressure. If the crank sensor was the problem it would crank but not even try to start at all since there would be no spark.
It sounds to me like either the fuel pump is getting hot and losing pressure or you are getting low flow out of the fuel tank to the pump. There is a screen in the tank that can plug up and restrict the flow. It won't be vacuum leaks and since the car will run with the ether it tells you that the ignition system is working. I'd focus on the pump and the fuel flow. You should also check the fuel filter.