I started the Scalded Dog before I pulled the dash and noticed a very odd behavior. The engine would idle fast (1Krpm) then settle down to about 750 then back up to 1k. It cycled like this until I shut it off. At low idle it acted like it wanted to die. I shut it off and proceeded with the dash pull/pod replacement. When I started it there were no vacuum lines disconnected. It acted like a gasser w/ a goofy automatic choke or something. It was if the engine was trying to find its "place" to idle. I won't worry about it until the pods are replaced and I get back to the engine issues. Any ideas as to the cause/solution?
Thanks,
Clint

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81 300D N/A 130K miles (Nelly)
87 300D Turbo 80K miles (The Scalded Dog...because it runs like a scalded dog)
95 e320 Wagon 104K
2003 Sprinter 47K miles.
1999 Tandem Bicycle
One beautiful low miles wife (who likes diesels) (that's my wife holding the sign)

My son and I fixing Nelly's odometer

Sounds like the overboost protection relay, or some other component of the EDS. Mine does this sometimes, although once it settles back down to normal speed, it stays there. Just occasionally I'll pull to a stop and it will "hang" at 1K and slowly make its way back down to normal ... and sometimes I will pull to a stop and it will drop down to dead low idle. From what I understand the EDS system gets older and can get "confused" in colder weather. Cleaning the contacts on my OVP seemed to help. There's a way to test and see if it's the EDS causing this, involving unplugging the connection on the back of the IP, but I can't recall the name of said component. Don't have my book in front of me. One of these other guys may be able to help ... they helped me.

Incidentally, in my case, the "solution" is to just let it act funky. But in my case, it only happens very rarely, and doesn't "hunt" for long ... i.e., just hangs a bit and steadily finds idle.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

I noticed mine doing the same thing a while ago, and when I looked at the engine I noticed the stop lever was bouncing up and down. I steadied it with my finger, and it stopped doing it. I don't know what was causing it to do that, but as long as she runs, I'm a happy camper!

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87 300D - Running on Veggie oil; 260,000 plus miles; Original #14 head