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'77 620 Idle Drops/Electrical Gremlins

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Runs smooth, idles like glass at 700 or so, then blaahhh... Like flipping a switch it suddenly drops and tries to idle at 200. Fuel and spark are fine--it doesn't stall like it was shut off, the idle speed just drops like a rock. Give it a little pedal and it idles fine. It seems like some emissions equipment is mis-adjusted. BCDD? Something else I never heard of?


It initially always idled too fast, like a vacuum leak, even with the idle screw backed all the way out. Is some valve open to outside air most of the time, then closes??


Also, erratic instrument panel operation. Gauges/turn signals sometimes work, sometimes not. Anybody know where the panel ground wire is?



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