I was rebuilding the drivers door hinges recently. The hinge mounts on the pick up needed to be readjusted, so I had to take apart the lower section of the dash under the steering wheel. I'd forgotten about a big/3 wire set of ground lugs mounted to the steel mounting bar next to the parking brake. The same bar the obd2 port mounts on. Twas rusty n prolly intermittant contacting. This time, after cleaning, I slathered it with vaseline n reassembled. I had a very intermittent engine stall that would only occur about once every 2 weeks, once a month, maybe, but then would start right back up n run great. Hopefully this was the culprit.