Before my 88 got a terminatorX I was constantly chasing idle and ignition issues. I couldn't find a good IAC, TPS, EGR sensor or ICM to save my life. One was constantly taking a shit. I bought a healthier motor that speed density couldn't support. I went to mass air with a fiveology kit. Nothing but issues with that too. He sent me two bricked ECMs. He had a hell of a time sourcing a 3rd. The ICM that was required with that kit wasn't CA "legal" for some reason and was a pain to get ahold of. Finally just trashed it all. Other than that I love the truck. I had no year preference but I do like the look of a brick nose better now that mine has the 92+ conversion.
Kind of a neat coincidence that I grew up riding in my dad's 55 f100 his birth year and now my son is riding in a 88 bronco my birth year. I originally bought it from a friend for $187 with a bad transmission. I can't believe the market on them now.