Chrysler Repair: engine stalls after warmup: 98 Neon, neon question, coolant temp

Question
QUESTION: 98 neon strarts an runs great cold.warmsup  to temp engine miss fires code 43 acts like it is starving for gas won't rev up any more barely idles then stalls out.wait for it to cool off and it does it again.just idling could take 30 minutes,driving less than 10 minutes.i just replaced rear main seal.drove it 6 miles to my work ,run perfect.8 hours later i left work,drove to nearby store and for got to push clutch in when stopping.less than 10 minutes.5 minutes in store cranked it up and it barely would idle,not rev up then stalled out that was the first time.only coil ruled out.fuel pump sounds like it is working.fuel pressure maybe.maybe it is sensors.any ideas

ANSWER: Hi Arthur,
You might well check the resistance of the coolant temp sensor to see if the reading drops down to arount 700-1000 ohm when the engine is warm, from a reading of may 5,000-10,000 ohms when cold. It is located near the thermostat housing and the has a couple of wires (tan/black and black/light blue) so read between the terminals on the sensor that attach to those wires. It is probably a mixture-related but the 43 code is very non-spectific as to why. The coolant sensor is the most likely suspect given the pattern you describe.
Roland
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PPS The 2 pins of the temp sensor (which has 3 pins, the third pin is for the temp gauge) are the ones labeled A and B (which should be etched into the plug connector for identification).

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QUESTION: coolant temp sensor did not ohm cold.would not start unless sensor plugged in.started ran for 5 minutes.unplugged it stayed running fans come on ohmed it on 20 k read 1.51.plugged sensor back in run till near failure ohmed it read 1.19 on 20 k

Answer
If the engine were finally up to full temp at the end of this experiment then the sensor should be in the range of 0.7 to 1.0K  I am not certain how hot your engine was but 1.19k seems a bit high, which may be causing a too rich mixture and thus the stall. But it isn't extremely 'off value' at 1.19 K unless the temp gauge was reading 1/2 scale or more in which case it really should be below 1K. Unless you find another fault code, I would suggest removing the sensor (after draining off some coolant for reuse so that it doesn't spill out of the engine when you pull the sensor) and putting it in boiling water to verify that it will go down below 1.0k ohms. If it doesn't then I would try replacing this sensor.
However, there is one other temp sensor, a combined intake air temp sensor/manifold absolute pressure sensor that is mounted on the top of the intake manifold near the port for the pcv valve's hose. It has four wires, and the wires in questions are on pins A and B (black/red and black/light blue). See what that one reads across those two pins of the sensor when the engine is cold and when the engine has warmed up and is stalling. It should have dropped down in resistance quite noticeably, similarly to the coolant temp sensor.
Roland