Ah, good point t walgamuth. It would do to check and/or replace the fuel filters too (dump out the big fuel filter into a container and see if there is a lot of dirt collected in it, check the little filter for dirt or water).

Also, check that all your banjo bolts and hose fittings are tight, especially the ones under vacuum. A small air leak in your fuel system can cause misfiring at low rpm but may even out at higher rpm.

Another potential leakage point is the large bolt that holds the fuel filter. Depending on the model year, this bolt has one or two o-rings that might no longer seal very well. When you remove the fuel filter you can get this bolt out.

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99 E300 Turbodiesel 100k