If i change the PCM to another used one do i have to do anything before hooking it up?

 

ECM ? depends where you get it from.

 

Same year 2005 F150 5.4l

 

It needs to be programmed to your truck and your keys. I had one installed a couple years ago and I let ford do it. I don't think they charge too much and I can't remember what they charged me, maybe between $100-$200 if that