96 E300D surging/missing after filter replacment

[jfulford]

I've got a 96 E300D with 258k on it. In the course of normal maintenance, I ran a pint of Diesel purge through the system, then replaced the pre and main filters. After restarting, I ran it for 20 minutes and then shut it down.
This morning, on the way to work, at 55-60mph, the engine starting cutting out/surging. I could counter this by hard acceleration or letting my foot of the pedal completely. It did this at just after coming off cold and the rest of the way (16 miles) to work. The vehicle idles perfectly and has no leaks. What should I look for? I did notice that when it was cutting out, I got a bit of white smoke out the tail pipe.
Previously to this, the vehicle ran fine on the highway.
Thanks
jeff

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