My guess is that you have a bad engine wiring harness.

It could also be a bad coil wire or bad resistor boots.

It could also be a bad throttle actuator or a bad mass air meter.

It could be a combination of any of the above.

There is an unbelieveable amount of info in the archives on all of the above.

I would start out with a search for "engine wiring harness".

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".