My first guess is the fuel system is full of algae .... have your been using some sort of an anti-algae additive to the fuel?

You may need to get the crud out for it to run normally.

Keep us posted,

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)