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? TIA, Wolff