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Update - I went ahead and replaced the wire harness to the speed sensor from the connector under the floor board (it's inside a weird plastic little connector box stuck to the underside of the floor board with a gob of black elephant snot) to the speed sensor, soldering in new wires at the connectors which are in good shape. Also removed the speed sensor to check it, but no apparent damage damage. Test drove about 1/2 hour, ran fine, no skips or stalls but got the 3-1-1 code again. Swapped out the instrument cluster for the one in my 93 and reset codes. No codes set on my 18 mile drive to work, but the 3-1-1 code was set again after I got home. Swapped the 92 cluster back in and reset the codes. Yes I'm going to do the CPS next, but wanted to rule out the wiring first and the instrument cluster.
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