This page is currently under construction - posted early to help
someone diagnose a bad ground problem.
Note 1 - The Throttle Position Sensor is VERY sensitive to poor grounds and the connector to the TPS often gets oxidized by moisture infiltration. On RENIX (Non-HO) 4.0L engines especially... you should check your TPS ground wire for leakage / high-resistance and if necessary install a jumper ground wire direct from the TPS side of the connector direct to the firewall ground.
If you have pics of your own repairs or can suggest other methods - please contribute your ideas (and pictures) to this article!
February 7th, 2007