Did you fill up at a place other than your usual place or an off-the-road store that doesn't do a lot of volume in diesel sales? Its very possible you've picked up a bad batch of fuel. I'd start with both filters and work from there. If that doesn't fix it, I'd move on to checking the tank strainer for an infestation but definately start with the easiest things first.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo