1987 300e, engine will quit suddenly when temp gauge reaches 100C. The tach needle drops immediatly as if you turned off the key. Recently replaced the following: Fuel pumps ( 2) plus filter, Cap & rotor, all plug wires and new plugs. New coil, replaced fuel relay. This problem usually occurs in stop and go traffic, once on the open road at speed, the temp gauge rarley rises above 80C. I do notice that when the engine is at temp, when I step on the gas hard, the engine will stumble until I back off, not consistantly though.
If I let the car sit with the hood open for approx 10-15 min, it will start fine. No problem with cold starts. Engine runs fine otherwise, no missing, good power.

HELP!!