The coolant light runs off of a sensor that is actually in the coolant over flow. If you look just above the lower radiator hose (the one that goes from the coolant tank to the bottom of the block) there is a plug for that sensor. It dosen't do anything but tell the low coolant light to come on when the float get's too low. I really can't see how that would cause any idle issues. Due to my Canton expansion tank, mine is totally unplugged and my light is off, so I know it will work with that completely bypassed.
If the car keeps burning up TPS's there must a short in that circuit somewhere. See if you can get a wiring schematic from Randy Stinchcomb or someone that has access to such things and see if maybe the Coolant Level Sensor and the TPS circuits are in the same loom. Maybe you have a couple of crimped wires and they are shorting at the same time. Also check and see if the MAF or IAC are in the same loom as the Coolant Level Sensor. If the wires are shaved down or crimped enough to show a little bare wire, maybe the water is just enough to complete the short and make the system go haywire until it drys out.
Are you getting a Check Engine Light? If so, scan for codes and see what you come up with.
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