I keep getting the coolent sensor bad message on my display. Does anyone know where I can get it and how much?

ALso, my jeep surges when I come to a stop, slow down or sit with the car running. It stops if I put the car in neutral.

I had the engine cleaned and everything changed but it hasn't gotten any better.

My display will cut out sometimes and reset its self. ????

Any ideas? Big trip coming up and would like it fixed.