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Originally Posted by Ron in SC
When I test drove it again I did several sudden stops and one of the times the rpm dropped significantly lower than they did the other times. They dropped well below 500 rpm but the engine did not die. The other times they never dropped but 500 rpm. I'm thinking maybe a fuel/air mixture issue?
Also I have the A/C compressor running it that might make any difference.
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Had the exact problems in my 1991 300E. Checked the OVP and fuel pump relay and all are OK. Changed the spark plugs and still no difference. Finally found the problem and it was the distributor cap and rotor. The contacts on the cap were so corroded that they just disintegrated when touched with a screw driver. If you have not replaced the cap and rotor in all these 100,000 plus miles, they need to be replaced. Mines were shot at around 100,000 miles.