when my car is in park, and I tap the throttle, the engine rpm will dip below 500, and the oil pressure will reach near zero, and sometimes the battery and/or bas-asr lamp will flash.. most of the time the engine does not stall.. however, a similar situation occured while i was driving

one time when coming to a complete stop, the rpms dipped below 500 and the car stalled

another time, when i was creeping in traffic, the rpms dipped again and the car stalled

any idea of what could be wrong? maf or camshaft sensor of some sort? is the timing off?

Not sure, but occasionally my 1985 380SE will do this (stalling) when the engine is fully warmed. It did it once today when I was pulling into a subway. I made a turn into the parking space and it stalled when I was turning into the space. I coasted in and turned it off. It always restarts normally. Sometimes it will also stall out when I shift into gear. The "tapping" of the accelerator and stalling is not an issue on my car however.

I have been told that it is probably the idle control solenoid, but I am sure that the 1998 is probably a different setup? Not sure, but it may also have a similar valve that is your issue?

Good luck.

__________________
2004 Toyota Sequoia Limited 4wd
1991 Lincoln Town Car Executive
1991 Cadillac Sedan DeVille
1988 Mercedes 300SEL
1972 Chevrolet Caprice Kingswood Estate 9-passenger wagon
1973 Pontiac Grand Ville
(Prior MB's: 1974 240D, 1985 380SE, 1984 190D, 1993 400SEL)