Look at the coolant temp first....either get the ohms it should be at a given temp and test, or see about getting a used one for testing. On a cold motor you dont even need to isntall the sensor, just unplug yours and plug the other one in. It will be ambient, very close to water at that point. See how it starts. Wifes legend was like this...nothing but crank, need starting fluid to get going. Bought the 10 dollar sensor and did just that, fired right up, so I installed it.
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