I've had a couple of instances in the past when the motor (2.8CRD) suddenly started running on 3 cylinders (at least, that's what it felt like, rough as guts and no power) and then just as suddenly corrected itself, maybe 10-15 minutes later, and ran perfectly for months after that. But this week's glitch was a real doozy.

It started Thursday morning around 10:30am. I'd just done a 180km run out to look at a pipeline route (what a surprise) when I felt that the motor was sluggish pulling away from a standing start: I then discovered that it was rev limiting at 3000rpm. It carried on like this for a couple of hours - no guts below 2000-2500 and incapable of revving over 3000 - then around 12:30 it suddenly corrected itself and has been fine ever since.

It's got me beat - any suggestions anyone?

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November 2006 2.8 CRD manual, CRDSTU front springs, King HD rears, Polyairs, LT245/70R16 Pirelli Scorpion ATRs, DP chip, Airflow snorkel
TJM alloy front bar, Ox 9500lb winch, Hella Compact 4000 spots, Complete set Mopar skid plates, Mopar cargo barrier
GME TX3440 UHF, Codan NGT HF

You probably have two problems. The intermittent rough running may be a sticky EGR valve. The second issue which you mentioned, is likely air or fuel filter related. If you can pump the fuel primer and it isn't hard, you have air in the fuel. The next thing to check is the fuel filter. It probably needs changing anyway so I'd just do that as a mater of course.

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Manure green 2005 CRD sport4x4, GDE Hot tune, Cat Gut, OE skids, Draw tight hitch, Duramax lift pump, 160K on multiple varieties of fuel, XM radio, Escort live with Redline, fog light mod, GPS, Icom IC7000 all band radio call sign KC9QPF, Grabber AT2s on Soft 8s, FIA grill blanket.