I've got the classic W124 ('93 300TE) idle surge problem, had it for a few months now. Oscillates from about 500 to 1200 rpm almost always when idling but not as often when in drive.

This wasn't a big problem but now it has turned into what I consider to be a safety issue. 1 out of 10 times when I accelerate the car falls flat on it's face, just kind of chugs like it's not getting enough fuel and after maybe 2 seconds it jumps to life and takes off like nothing ever happened. Runs perfectly at all other times.

The only band aid I've found so far is to do somewhat of a brake torque, I'm not talking burning out, just enough gas to keep the rpm's up prior to accelerating.

I haven't been able to find any vacuum leaks, the car runs the same with the MAFS disconnected, OVP seems good.

Any ideas?

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1987 300SDL 167k
1992 Volvo 740 140k
1990 Volvo 740 250k
1989 Volvo 240 269k

Anyone want to trade an old Volvo for an '87 300sdl?