DME idle through roof.

1) It's been pouring in So Cal
2) I had a really long commute this morning.

Car ran fine. At lunch though, it started and the idle stayed at 2100 rpms. Got lunch, drivethrough etc, still at 2100.

I know the problem isn't the idle out of nowhere like that, but to get home, I need to lower it.
There's a trick to shorting a couple of connectors in the engine compartment and then turning the idle adjustment, but I can't remember which ones.
Does anyone know how to lower the idle? (books at home)
Thanks in advance.

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Kurt B
1984 911 Carrera Cabriolet
75 914 1.8