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2003 7.3 rough running erratic starting
2003 F250, CC, 4x4 7.3 auto. 136,000 mi. All stock except 6637 filter.
Noticed last week driving at around 55 mph (tc locked OD on) it felt like the engine had a very slight surge or perhaps rough running. Ever since I've owned it it's started a little bit erratic. Sometimes it cranks for 2 sec then fires right off. Sometimes it's 3-4 seconds. Not excessive but a little bit longer. Then last night I'm driving down to advance auto parts, about 35 mph TC locked in direct (3rd gear) and really noticed the part throttle surge. Just at a steady speed, just enough throttle to maintain speed. A little more throttle and it goes away, or at least I don't notice it. Let off from steady speed (go into coast, OD off or OD on either way) and I dont' notice the roughness. No CEL and advance couldn't get any codes, however I think the guy doesn't know how to run the scan tool properly. I drained the fuel bowl and it didn't seem to make any difference. Fuel filter is a new motorcraft, less than 1500 miles on it. Oil was changed yesterday-however the problem has been going on even before the oil change (I've had it for about 3500 miles and the oil/filter were done when I bought it with motorcraft stuff, and I also use motorcraft). Only other issue I have with the truck is the overhead console, which is out and being repaired as we speak. I can't see well enough to solder PCB's.
I'm all ears for suggestions. It doesn't really feel like anything major however I like to fix stuff before it does get major.