It's been said that the OVP provides current to the fuel circuit. If the 10 amp fuse is/was loose and pushing on it altered the engine speed in any way, I'd be suspicious.
You might try searhcing the archives on this list, both current and for '99. Alot has been said about the problems created by faulty OVPs and the 10 amp fuse contained within.
Mike Murrell
'91 300-SEL
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