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Check engine light on- intermitantly idleing at 2000rpm- Help 200

I have 1990 240 with M47. I check the codes and it said "mix to rich at idle" and "idle ground problem". What is it? The car drives perfect. I reset the light and it has not come back on, but it did idle jun\mpy once after resetting. Help!
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1990 240- 230K- IPD cam, springs, bilstiens, 3''exhaust, euro lamps






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