Mazda Protege Random Stalling and No start Fix

i have recently been working on a few Mazda Proteges ranging from 1990 to 1993 with the 1.8 ltr and the most common cause of the no start or stalling happens to be the coolant temp sensor, it tells the ECU what temp the engine is at the colder the engine is the richer the fuel and vise versa it will lean out if to hot. even if you dont have a check engine light on its worth the 15 to change the sensor to see