I recall on this forum where someone had a similiar problem and they simply cleaned the air sensor which was very dirty and weighted down. It is worth checking it out.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)