Had a very similiar problem with the 91 300E. I went through a lot of the above and more.
Finally a MBZ tech friend replaced the coil. Not only did the start up weirdness end but the car just ran better.
I don't know how to test a coil, but you may want to look into it.
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)
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