I have a 2007 Ford F150 5.4 4x4 that sometimes will crank but won't start. The last time it has done this it has been about 30 degrees and It only acts up when it is cooler. 99 times out of 100 it will start no problem. I've replaced the fuel pump relay and I can hear the pump when I turn the key. What could be causing this? It has 100,500 miles on it.
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