I had a coolant leak, went to a shop, they pressurized it and found the leak, gasket in thermostat housing--- They flushed the coolant system. On highway my temperature went up--bronco would not accelerate until it cooled down so I took it to another shop and they put in a new thermostat------and they also put in a different coolant sensor( other than the standard one ) a TS10001--- The Bronco always started up when cool from overnight and ran about 1200 until warm and then normal idle--about 7-800-------But since the new different model sensor was put in, in the morning it starts and drops to 2-300 rpm labors a little and I have to tickle the pedal to get it higher. They took out the original coolant sensor and put this one in-----( they charged me $180.00 -ouch! )-my question: is there something in this type of sensor ( like maybe resistance different) that the eec-iv computer doesn't recognize and it is not positioning the idle valve for fast idle start?? OR- does the computer have to recognize this new sensor first--like driving it around for a while ? I think I noticed also that they put Teflon tape around the sensor threads ?------Everything works fine when warm and on the highway and it operates ok--it is just the cold start has changed-- Anyone have any suggestions?