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The 4.6 and 5.4 engines are famous for bad plugs and coils. You will need to either have a shop diagnose the problem, or you if you can recreate the issue and the MIL light flashes, the computer will tell you which cylinder is the problem. You could check each coil for resistence, should have about 5.5 ohms from the B+ connector to the end of the coil (where the plug goes). Anything less than about 5.3 ohms will likely cause you problems. Normally, just doing the plugs willc lear the problem if you are not getting a full misfire and your MIL light flashing
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