What year is your car and what engine do you have?

I was going to suggest replacing your OVP, but on the older KE fuel injection systems, the engines will run fine with a failing OVP or even w/o the OVP.

1993 and newer 300TE's have the newer electronic HFM system, and could exhibit your problem with a bad OVP.

__________________
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".