Have you though that maybe a spark plug blew out or came loose from its hole in the head. Can you isolate the noise any?
Give us an idea where the noise is coming from left, right, ect.
What have you found out so far?
Ford Technician
Work for multi-line dealer Including Ford, Shop foreman, Ford certified.
OK again i say it sounds like the spark plug blew out Can you look to see? it could simple as reinstalling a plug. But you must look at them on the noisy side! I can helps you and will but you must be able to do the leg work since I'm not there. I sent you a pm you should read it. I will be ofline 1 Hr while I drive home but will be online again