Help please!

Car is acting very strange. It's a '92 500e.

On acceleration, car pulses very subtly. On deceleration it does the same thing. Occasionally, when going from D to P, idle will surge up above 10k, then gradually come down. Sometimes when this happens, ASR light goes on. Also, more troubling, when driving, the ASR and ABS light come on and acclerator peddle offers no response. In this instance, I shift to N, turn off ignition and turn on and we're back in business. No fault codes to give us a clue.

Just replaced brake light switch, with no effect.

I'm at a complete loss.

Thanks for any help/ideas you might have.

__________________
RJ
'92 500E
'75 Triumph TR 6