During warm up my car runs perfectly fine, VTA1 & VTA2 voltage readings come back exactly as they should. As my engine warms up and approaches 82-83C my VTA1 voltage reading will steadily drop down from 0.70v (still in normal range) during idle but once the VTA1 voltage hits 0.28v my PFC Commander will highlight the VTA1, and unless I'm in gear or giving it throttle, my engine will cut. I'm trying to determine if this is indicative of an issue with the TPS itself (I don't think it needs adjustment since the voltage readings for both VTA1 & VTA2 come back within normal range) or if its some sort of connection/wire issue & I need to look at the wires. Any input would be greatly appreciated!

 

Start with recalibrating the tps to the higher end of the range. If you have all the warm up systems in place then it sounds like you just have some weird stuff going on. With a power fc, you can delete all of it.

 

The fast idle cam/wax rod unit opens the throttle when the engine coolant is cold.
When this happens, the 2 tps voltages should be higher than the normal.
It appears that someone adjusted your tps when the cam was engaged, cold engine.
For a cold engine, insert something between the rod end and the cam adjusting screw to disengaged it.

When you push down on the lever, it disengages it.
See attachment.