I led the mechanic at the time to think the glow plugs weren't working right and I couldn't figure it out... did all the normal tests. In the end, after he replaced the GPC (which I found working properly, but he insisted they were "tempermental") it turned out only to be a faulty dash indicator ground, but I was still left with the really rough idle

... I can't quite remember what else he did... Oh, OK, Nuetral safety switch which I told him to do and had nothing to do with the problem. OK. So he only screwed me for $300.

Anyway...

I do have good oil pressure. I actually installed an aftermarket gauge and I get 60+PSI when driving highway down to 17PSI when warm and idling.

In the winter it feels like it's running on just one or two cylinders until fully warmed... in the summer it feels like it's just missing two perhaps. This goes away at higher revs and goes away completely after say 10 minutes of highway driving... bring her back down to idle and she's fine.

I would say minimal to moderate smoke out the tailpipe.

Bill

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'87 300SDL, intensely modified Greasecar setup, with nickle plated heat exchanger, 3 valve setup, 312,000 miles
'95 Suburban diesel, Greasecar basics, 16 plate heat exchanger, mercedes fuel lines, Racor filter
'85 Renault Alliance converted full electric vehicle