Thanks for the replies,

Kweimer,
I don't think vacuum is a problem. A P.O. had installed a vacuum gauge under the hood. I check it every once in a while and all seems to be OK. I don't experience any problems with braking, shut down, or door locks. The ACC is not quite right, and every once in a while the transmission might shift a little quircky, but generally, everything in the vacuum department seems to work properly. I will monitor vacuum a little closer to see if there may be a connection.

psfred,
I did not think of readjusting the valves. I figured since I had done the job, that I could check that off the list. Now that I think of it, it does act as it did before I adjusted the valves.

I only add one quart of oil between oil changes (every 2,000 to 3,000 miles).

If readjusting the valves does not help the condition, I would lean toward having the injectors checked. How difficult is removing the injectors? Are ther any special tools or equipment required to do the job properly?

I will have a similar job to do on the pick up (see signature), it is in need of a new injector pump and I would like to replace the injectors as well. I understand it really makes the engine run as if new.

Happy New Year and thanks for your interest,
Doug Vazquez

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1980 Mercedes 300 SD, 215,000miles
2001 F-350 Powerstroke turbodiesel, Crewcab, 4x4, 81,000 miles
1993 Chevy Suburban, 185,000 miles