I changed the crank sensor for $9.99 last week. I went for that because when I changed the engine out, I pulled the old one from the last engine and it was hard to pull out. Thought maybe I cracked it without knowing it. The fact that it never, and I mean never faults when it's cold soaked over night or longer leads me to believe it is temperature related and if the ICM has circuitry in it that may open from the heat off the block, I like the chances of it being my culprit. Of course I'll look at the connections when I pull it but if I can find one from Craig's list cheap, I'll swap it out. Rather expensive to get new. I'll check the Haynes manual for any testing I can do. I there are values to check for, I'll check it cold and hot. I think we're closing in on it. Thanks for getting back to me.