The coolant switch failed again. I noticed as the mercury dropped the car would stall at a rolling stop or idling at a light.
I ended up purchasing one of the official AMC testers for the feedback systems. It's nothing special other than it reduces an hour or two of testing down to about a minute. I really don't need it but I couldn't resist the bragging rights.
It immediately hung up waiting for the car to warm up. I waited until the engine was clearly hot enough to open the thermostat and then checked the CTS from the diagnostic port. It was open and forcing the car to stay open-loop. When I went to disconnect the harness to test at the switch itself it separated into two pieces.
When I rebuilt it back in June I used JB Weld. While it should be able to handle the heat of a wet manifold it was now a brown color and crumbled. I reached out to a connection and bought another one that was used, but supposedly good from a junked rust bucket. Unfortunately it to seems to have an internal corrosion issue. I'll swap them out for now and rebuild the rebuilt one again but use a high temperature rated epoxy.