Re: 87 Bronco major issues
Sounds like an electrical problem IMO. I would check your starter relay, alternator wiring, and primary wire from your battery.
I had a similar problem when my alternator primary wire melted...weird idle, dying when idle dropped too low and running rough. A short or drop in ampacity from your electrical system can cause big problems with the computer that mimicks other problems.
Maybe something got too hot when your starter fried???