Thanks for the reply.

The car does not have traction control (And who doesn't appreciate a little wheelspin now and then?).

I checked the linkage the other day, it felt smooth enough. I might grease it this weekend. The car does run like it has a sticky linkage (on/off nature of throttle) but it doesn't drive like it, if that makes sense. Everything feels smooth physically and mechanically.

My CIS 928 has a WUR that occasionally would act up. I ended up modifying it to be externally adjustable. Is there something similar in the J jetronic system? Cold start valve sticking? How do I check that?

I have a half a mind to just inject some Mystery Oil into every vacuum actuated device under the hood to loosen things up.

Also, I have heard weird stories about what a failing OVP can do... does this sound at all plausible? Really it doesn't feel electrical in nature, but who knows. I could switch it out w/ the one from my wife's 300SE, but she would kill me if she found out.

The car didn't act up at all yesterday, but it wasn't too cold. The intermittent nature of the problem makes it tough. Car either runs fine the whole commute, or acts up the whole commute (20miles one way, 90+ mph at 4:30AM)

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1990 560SEC
1988 300SE
1978 928 euro S engine, big brakes, and more
1996 Suburban TX shark rig
1988 Suburban Pacific steelhead rig
1992 300 TE (recently totalled )