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High idle, bad idle stablizer valve and/or vacuum leaks, and/or with the dirty battery ground some previous person set the idle high to compensate.
I think the OP mentioned no cats, so heat isn't likely rich mix going to cats, unless it really does have cats.
**** Sound to me you just need to add a word to the 87 928 S4 .... "restored". Which end you starting at?
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