w210 , 99 300 TD
Misses on start up. Feels like one cylinder. Been slowly getting worse. I suspect a leaky injector. No external leaks. Idles rough till thourghly warm.
Has a glow plug issue also but I do not think it is related.
Solution, pull injectors, send to local shop for evaluation, while at it replace bad glow.
Please confirm or deny my ignorance.
If you are wiser or posess knowledge greater than mine please educate me.

If its slowly been getting colder, it may be a bad GP manifesting itself.

If you had known good GP's, you could crack that inj fuel line and see if the idle changed. With a possible bad GP, doing so wont prove anything.....

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)