Turn OFF the CAPS!!!!!
Your issue is most likely the 2003 PATS(passive anti-theft system)
2001-2004 Rangers had a Type E PATS system
Type E disables starter motor and fuel
The PATS module and factory PCM(ECU/computer) are "married" at the factory, if you swap PCMs then they need to be "re-married" and only a Ford Dealer can do that, and it takes about an hour to 90min. of shop time so ain't cheap, plus towing it to a Ford Dealer because they don't make house calls.
This requires a subscription to the Ford Data base, and is why others can not do it, only dealers.
Not sure if you can just disconnect PATS module, since you have a new PCM without PATS(1998) that may be possible.
PATS module is usually located above glove box behind passenger side air bag.
My guess is no, I would think some of the PCM functions would pass thru the PATS module as a backup to prevent removal allowing engine to run, not much point in an anti-theft system that can simply be removed by a thief.
Last edited by RonD; 09-30-2014 at 02:53 PM.