The pcm uses the coolant temp sensor in open loop (cold start). If it fails, it will usually read very low which means the pcm could think it’s 12 degrees outside when it’s actually, say, 90. Generally, the engine will flood out and not start or need throttle input to stay running if it does start. I would be looking at tune up items if the mileage is up there or the infamous vacuum elbow to the throttle body if it’s a 4.0. Of course have engine codes read if the light is on (even if it’s not, there could be pending codes that will help clue you in).
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