Just bought a 1991 300E 3.0 Gave it a tune up, Plugs, wires, air filter, Cap and rotor. very hard to start in the A.M. after sitting all night. After warmed up (1-2 min) it runs fine. Also has a rough Idle. Any feedback would be appreciated.
The OVP fails from the cold solder joints within. I'm not convinced this is your problem, however it's always good to keep a new spare in the trunk.
Since it's only cold starts, I would lean towards the fuel pressure accumulator. I did a simple search and found this. Post 6 is helpful. CBC_ATL always comes through with the links, lol It appears that this fixed the poster's problem. Good Luck.
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