ICP !!!

Exact same issues for mine, and many others. Even a tech bulletin out for the techs to watch for bad ICP's....for some reason, mine took 4 trips before it actually kept a check-egine light and threw the correct code.

check this thread for more info: http://www.fordtrucks.com/forums/sho...ght=ICP+valve+

and/or do a search for ICP.

good luck!!

kh