I am wondering if your fuel system is simply dirty?
I had great experience with the double techron dose. Have you done any fuel system cleaning like this?
Also, have you cleaned the air mass sensor plate and surrounding area. I read in another post this helped someone with similiar problems.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)