is there a particular fuel injectors that needs to be used for Ford expedition?

What is your question?

i got new fuel injector for the expedition because it was misfiring and now the guy that is working on my car after he put in the new fuel injectors(all 8)it won't crank, so he went back and put in old fuel injectors now it cranks. if its a new part, i don't get why it won't crank, does ford need a particular brand of fuel injectors?

What makes this problem better or worse?

going to a hill, and it misfires and no power

How long has your 2006 Ford Expedition had this problem?

few weeks