Have you checked chain stretch?
Compressoin check? How are cold starts?
Air leaking into the fuel system, even from little pin pricks here and there, can cause trouble.
There generaly arent that many things that will make a diesel run bad. It can't be too hard to find.
Absolute worst case is the injection pump being bad or some buggered up valve/seats I'd imagine.(i know you really want to hear that)
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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K
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