I agree. It has to be a fuel supply / pressure problem or a very slight vacuum leak that is hard to find.

Remember, my terrible oscillating idle problem turned out to be a vacuum leak at the intake manifold seal, but it only occurred after the car had reached operating temperature.

__________________
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".