Howdy,
Yep, I tried 2 consecutive tankfuls of it. It didn't seem to help the idling problem, unfortunately, but it seemed to give a little better throttle response (or it could be just my imagination).

I've heard that the fuel pressure regulator can cause idle problems in the 119 engine and have been thinking about replacing mine.

I also wonder about the role of collapsed motor mounts, since I've been reading a lot lately about how they often are shot in our engines after about 60 k miles, and can make a little idle shake more noticeable.

__________________
Steve
'93 400E