[rdlamb]

Hi Kevin:
You have a few things that may be going on, in addition to the injectors/injector pump that I mentioned earlier.
Water is a big destroyer of diesel engines. You were wise to replace the fuel filters. There is a big debate about fuel additives, and which ones to use if you use one.

I like lucas, power service, howes, and stanadyne. You cannot go wrong by purging your fuel tank, then filling it with fresh fuel, and using an additive.
If you have deposits blocking the free flow of your fuel this may produce the symptoms you described.

The other thing that comes to mind is your turbo. When you travel short distances, that do not fully warm up the engine and its intake/exhaust lines, the rapid heating then cooling of the lines draws moisture.

That moisture can destroy your turbo. You should check the turbo's gate valve, bearings and (if present) waste gate valve.

Last, perhaps your model has an uptake pump in your fuel tank. This "primes" the fuel system by directly pumping fuel at the fuel tank into the fuel line, allowing it to reach the engine fully pressurized.

Whew, sounds like a lot but not impossible to test yourself.
Safe travels
Rick