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(1st post) ain't cruisin

Check your vacum lines for leaks, on an 89 thats a good starting point.
Do your heater a/c controls all work? If not, then it's most likely a vacuum leak to the canister in the front bumper.

If not, it may be the multi-function stalk itself. Had mine replaced twice on my '90, once under warranty. Cost about $150 at the dealer.