My truck shows "reduced engine power" when the weather starts to get cool. Start

What is your question?

When the weather starts to get cool the "reduced engine power" shows on the dash and I have to stop and turn the engine off. After 30 to 60 seconds and a restart the engine runs fine but the check engine icon shows on the dash. Sometimes I have to do this 3 or 4 times. My dealer checked it and the code of P1516 was thrown. The problem is they told me it could be any of three things each costing $400 to $500. Two of the items were a TAC Module and a Throttle Body and the 3rd I forgot. The problem is that I dont mind spending the money but not knowing which item is the problem is like playing the lottery not knowing if I was going to win or not. Has anyone else run into this problem???