Just how big of a problem is the Cam phasor
 

Just bought a used 2006 Ford F-150 5.4 motor(47,00 miles) on the OD.How big of a problem is this cam phasor issue?Thanks for any info.coobie

should not be an issue on the 06 and newer, mostly an 04,05 problem, the other problem would be the spark plug issue, with the miles low, it might help to do them early and forego the siezing in the heads problem that they have in the higher milage engines.