One other thing I thought of the other day and couldn't find your post, but even though your symptoms don't really sound like it compleatly, but maybe your coolant temp sensor is bad going to the ecu, not the gauge in the cluster.
I've never experienced this, but I've heard that the car won't idle but also wouldn't drive very good (bogging and such). IDK, if there is a way to check it, but you may wanna look that up.
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