Sucks about the glow plugs. I doubt that at 208k, your injectors are spraying properly or within spec. I bet the nozzles and pintles need to be replaced. Doubtful cleaning them will do much good.

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900