I have a 1989 300E with 857,000km on it. It has been a great car. I have an issue where when I start the car it runs great but when it gets to operating temp (80 degrees) the car starts to shake and the rpms drop close to 500 but the car does not die. When the car is cold it runs great. I was driving the car and when the problem started I pulled over because the car dropped in speed. I put the gas pedal to the floor and the car does not pass 40km. When pulled over I put the car in park and reved the car. The car sputtered and sounded like popping from the exhaust and then the car idles great. I put it in drive, step on the gas pedal and the car drives good until I hit 40km and the problem starts all over again. If I let the car idle for 10 min or more the car does it's problem.

I just recently installed a new cat converter, spark plugs, ignition wires and air filter to see if it would correct the issue and nothing helped.

Does anyone know what I should look for?

Thanks


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