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I changed out the sensor. Oddly enough the one I took out was ALL black plastic. The connector, the threads, the tip... The one I put in was grey plastic on the connector and the threads and tip were copper.
Seemed like a much nicer piece.
Fired the truck in 10 degree temps and it fired right up and idled at 850rpm for a second and then went into the warm up RPM. Then after a few minutes and it started to warm up it dropped back down to normal idle speed.
Seems to have fixed the problems. I didn't have a volt meter worth a damn, so I just replaced it..
I was beginning to wonder why my mileage had been steadily dropping. I think the sensor was running the motor too rich.
its a vacum leak