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Same issue on my 2001 PSD.
Started last summer. On a long trip the truck started surging while at light load. WOT was fine. Got stranded out of State. I found that it had used 3qts of oil in ~2K miles while on the trip. The truck NEVER uses oil in day to day driving.
Truck had an Edge W/Juice on it.
Swapped out the TPS, CPS, ICP, tightened all the pins on those sensors & drove home.
Issue has been random (but not as severe) ever since.
6 weeks ago driving through the Nevada Desert it happened again. Used 1qt of oil too.
Weird thing is it's perfect when cold. & It'll drive forever if you never shut off the truck. Shut her down for 15+minutes, then fire her back up & it'll have the surging problem at light load cruising.
Things I've replaced:
Returned programming to STOCK (seems to minimize the issue)
IPR & wiring
ICP & wiring
Oil temp sensor
It's now developed a slightly rough idle when it's warmed up. When the motor is cold, she purrs smooth. Once warm, she's got a slight miss.
Took the truck to the local Diesel shop today.
Buzz test seemed normal.
They hooked up a manual injector isolator to shut off each injector (contribution test). Test wasn't working right, then the truck died. Killed the IDM. New IDM & the problem is still there.
I'm at my wits end.
I'm about to yank the valve covers & swap Injector O-rings, Gaskets, Wiring harness & while I'm in there Glow Plugs.