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In case its not the DME relay...
Take a look at my "Electrical Help" post. My 85.5 had similar problem, and even though I'm not 100% sure I've got the problem corrected, I believe it was the throttle position switch. Mine had moisture in it, which I'm guessing resulted in incorrect signals to the DME unit.
Hope the DME relay fixes the problem for you, but if not... I would check the TPS switch next.
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