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Hi Im David. well first off welcome to the site. secondly you are now part of thousands and thousand of f150-250's that have the 5.4 triton 3 valve engine that is involved in a class action lawsuit against ford. http://gotaclassaction.com/ford-sued-over-latent-defects-in-vehicles-equipped-with-the-5-4l-engine/
you can replace the timing chains, tensioners, vvt actuators, guides, change the oil and filter. and maybe it will run better. the only 2 vehicles out of the 5 5.4's ive had luck fixing i had to do the following : replaced the head gaskets, rollers, cam phasers, timing chains, guides tensioners vct solenoids. a questionable intake valve and exhaust valve on each head.
the success rate of curing this engine of its illnesses are extremely low. there is no common fix. its a nightmare engine for sure.
pull the font cover, pick up the pieces of broken plastic timing chain guides pieces then get a whole timing set. and re time it.
wish i could give you better news. but there isnt any with this thing. average price with parts and labor in my shop 4000.00 and im cheap.... no. new phasers only wont fix it.
no.... read some of the complaints and attempts at fixes in the lawsuit.... nothing fixes these things.
that would be the best bet. in my professional opinion. but get a good warranty