I need a computer for a 1997 F250 4x4.Where is the best source to get one.What brand to look for,does it have to be programed by dealer.Truck showing code that 4 coils are bad replaced coils & spark plugs still didn't fix. It has the 5.4 motor thanks for any help!

 

1997 - 2003 F150 - Ford Truck Enthusiasts Forums Here is a link to the page for your truck, probably better to ask the guys there.
However you could try rockauto.com for one.