[Bassasasin]

Yah just a plug.. It has plastic you have to pry back to let it come off..

Hope this works.. but if it dont.. its eliminated, and we are further along.

Your disription of how long you drive it makes a bit of a thought change. Im a bit confused how you can drive a mile without touching the accelerator.. but anyway we kindof took the path of the sensors from your first post.

The CTS or I noted I typed ECT.. yah ECT. this is sensing the temperature of the coolant in the engine, not whats in the radiator, the coolant circulated in the engine and the thermostat adds cooler fluid as it opens when it gets hot.
It also runs your guage.

Has your temp guage working normally?
Perhaps we are dealing with a thermostat problem when its still pretty cool. It would make sense since when you stop the engine heats up a bit since the coolant stopped circulating and that thermostat gets much hotter and can open and if its sticking a bit and snapping open after you stop after a mile it could be the whole problem.

This could be your thermostat is stuck open or sticking. It would be lucky if this is it. Its a very cheap fix.
But, lets just take one thing at a time.

Good Luck. Ill be waiting.

Bass