You need a new (input) Transmission Turbine Speed sensor (part # 4800878) and Output Shaft Speed Sensor (part# 4800879). You should only need a torque wrench to replace them from what I have read.I have the same problem, with same symptoms, and same car. The parts are fairly cheap, and a LOT less than what you will pay someone to do it for you. Google the parts by name and look under 'images' tab to find a diagram for their locations. Hope that helps, I am replacing mine tomorrow.