Thanks for the info Jim. I had black smoke coming out the exhaust when the engine lost power. The black smoke could be the ignition cutting out or a super rich condition. I would not think that the intermittent CTS would cause what I was experiencing, but thinking of your failure experience I am not so sure now. However, I was getting the intermittent check engine light all day without runability issues, so... Hmmm.
I recorded the CTS plug positions at the ECU so I can run a continuity test while wiggling the wires today after work. I have a new plug I could wire in if the wires at the plug are faulty. If the wires seem good a new CTS is cheap.
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