Change the tps, set it and forget it. Those tps are a PIA, they seem alright when checked then you drive it and the go outa range. I am on my 3rd one now and they updated them, the most recent one is a little different. I was chasing this type of gremlin, and when I changed it she was good to go. Especially if it wont go into reverse, it stinks of tps outa spec. my two cents.