I have a 2006 Nissan Altima 2.5S and I have made many repairs myself. I installed Crank & Cam position sensors, thermostat, fuel pump, flushed radiator, spark plugs, and reset my computer, my temperature gage will show that the car has reached it's proper temp. Then when stopped at a light the gage will drop to cold and the car stalls. When I am driving on he expressway it acts like it wants to stall. Again it is when the temp gage drops to cold. Does anyone knows what causes this? PLease let me know.
Try checking your thermostat, get one that opens at a higher temp, a normal thermostat open at around 190 deg. Try to get one that opens at a higher temp. What I believe is happening the cooler water from the radiator is being released, and it is giving the engine a sudden change, if that makes any sense. You said as long as the gauge is indicating operating temp it runs fine correct?
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