I've been having some issues with the automatic in my 99 wanting to shift way too early out of first gear and then slipping slowly into second and some other strange drivability issues so I got a much lower mileage PCM out of the junkyard. It is the EXACT same calibration and everything. I popped it in and drove around and the transmission shifting is better and so is the other weird issues I had, but not totally solved yet. Anyway, I had read several places that the PCM's are all programmed to the exact car they came in. Do they store the VIN number in them or something to identify them? I put my scan tool on it and I couldn't get it to spit out a VIN or anything else that would identify it as being swapped out of a different car. So are these things really mated to the cars from Ford or is that a rumor?