Has anyone looked at the crank position sensor yet? Its also known as the reference or rpm sensor. Its located at the top front of the transmission bellhousing where the housing meets the engine block. Open the hood, lean over the passenger side fender and shine a flashlight down the firewall to see it. The sheathing seems to crack on the older versions. The older version can be identified by a yellow stripe. Cracked sheathing doesn't necessarily mean the sensor is bad, but it surely doesn't help.