I've been doing some reading and see this problem is kind of common.I have 07 frontier 6cyl auto. When I go up to my ski cabin the next day it turns over quite well but won't start. It s like its not getting gas .But the wierd part is as soon as I jump it it starts instantly , I have changed battery twice. It's NOT battery. It's like when it's cold I think a sensor isn't working or ecm isn't working..but why a jump help makes no sense. Also i was up recently it wasn't cold but had same problem. Could it be altitude ,up 5800 feet ? I did read maybey ecm relay. I bought one but having problem finding where it is. I think it's on bottom end of Ecm Do Ihave to take out ect to get to it Here's a picture
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