Alex300DT- you deserve your moniker! Today the car was really acting up and so that gave me a chance to try your advice and it seems to have worked!!! I have simply pushed the harness up and away from the body of the IP so it was truly suspended in the air between the intake manifold and the IP and the surging went away. Had to go to work so did not have a chance to mess with it as much as I would have liked but things are looking up! Something in the harness must not be OK so I will have to take a closer look. Thanks again - what a great forum!

My 82 300cd does this but doesn't have any electric doodads...

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

I just got a catectomy and resonatorectomy last night. My hunting/surging is gone. Seems like the cat is certainly a culprit worth looking at. Best $75 I have spent in a while.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42