Noticed big time loss of power while pulling last week. Happened everytime tranny would kick down to climb a hill. Engine was running fine otherwise. By the end of this 600 mi. trip everything seemed normal. Truck had sat in cold weather for 1 week prior to this. Possible frozen fuel filter? No dash lights came on. At first I thought it was an injector problem but that would not have gone away right? When the injectors go, does something light up on the dash? Thanks for all the info.