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Boost drops '91 200 tq

Hello all,
Got a problem on the '91 200. The boost builds normally when the go
pedal is mashed. Get's to 1.7 and then drops to 1.4 or so after 3
seconds. Pulled codes and got 2121 which is "idle switch bad", but I
get  less than 1/10th ohm resistance on the idle switch when closed. Any
ideas what to check?