My car runs and idles perfectly on startup but as soon as the car reaches operating temperature it loads up on gas and runs poorly. Someone suggested checking the coolant water sensor for resistance. What should the resistance of the sensor be on a cold engine, hot engine?

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jcciem
'94 SL5000 60,000
'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000