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The 3 trouble codes you have are for Misfire on start-up, Random misfire and a cylinder 1 misfire. Most common on the 4.6L motors is a bad ignition coil going bad on the motor and needing to be replaced. Every cylinder on your motor has its own ignition coil unlike other vehicles that have 1 coil for all the cylinders. What I recommend doing is replacing the #1 ignition coil with a new one, clearing the codes in the computer and then driving the vehicle to reset the memory. Cylinder 1 is on the passenger side of the motor, the first cylinder from front to back.