My 300SEL has been idling a bit rough lately...sometimes it will run perfectly smooth, and other times it will run a bit rough, and then other times, out of nowhere it will misfire horribly for a second or two, then start idling smoothly again...really random but it seems to get a bit worse when I shift into reverse. The ABS light has also been turning on and off randomly...

I'm assuming this is OVP related? Are there any other symptoms I should look for?

Oh, and I dunno if it's related, but my tach is a bit bouncy...

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles