A gremlin appeared that started troubling me on my 1991 940SE wagon. After jabbing the accelerator slightly as when making a left turn and then releasing the pedal, the car would flicker the dash lights and stall. It always started right up again. One time it did it changing lanes around 45-50 but it caught itself after flashing the check engine lights briefly before the dash lights lit but turning the key on and the engine caught and ran.
Subsequent experiments revealed that when I was leisurely going along at 20-30 and stabbed the accelerator while turning the motor would conk out. It always easily restarted. I once had a CPS problem but that would make for hard restarts. This never had a problem restarting. In fact it was instant. I thought major vacuum leak and I replaced the suction tube to the power brake assembly that revealed a crack. I pulled on wires near the harness, CPS, and coil and then redid a couple of vacuum lines -PCV included thinking it was a vacuum leak. I changed the Idle Controller but the same. Cleaning the throttle body it occurred that the Throttle Position sensor might be bad. It clicked fine at base level but I recalled an earlier TPS on a 145E I had had a distinct dead spot just about 2000=2300 rpms.
This was the problem verified by substituting another used TPS.
Evidently the TPS was worn at the base or zero setting, not sending a signal to keep the rpms up to 750-800, and so on quick deceleration when the throttle plate was shut it was choking itself off. That's why a little tap and press on the accelerator always got it running fine again.
But it was unusual to have the TPS not functioning well on deceleration, since it started and idled fine. Maybe someone has similar symptoms and my experience can help someone.
Just glad to have found it and restored its great reliability after 349,000 miles