Coil and plug. Sounds like it's misfiring to me.
Coil part no. 3L3Z-12029-BA
I work at a Ford dealer. My 2005 did it all the time.
The ticking is the phasers and solenoids. Mine started ticking like a diesel around 150,000 mi. When I finally got rid of the truck with 215,000, it still ticked. Phasers are very costly. To do the job correctly, you'll need:
2 Valve cover gaskets
Front cover gaskets
Preferrably..timing chain tensioners and guides. Shouldn't need chains...unless they stretched.
Let me know if you need prices and part numbers.
Koons Ford of Baltimore, Inc.