Spent a decent amount of time wrenching on the Ranger tonight with Ben (thatbluecar). I was basically given an Explorer today, but since I have no room or need for that 'tired' rig I stripped off a bunch of parts and passed it along to someone that could use it and wanted it. I got lots of pics of what was done, boiling it down I have a new airbox on the truck (finally!), and I'm running the Explorer PCM with the Explorer's MAF sensor. Now it's behaving slightly better, getting a better reference voltage to the TPS but it still didn't fix anything. I also have developed a 'check engine' light, so tomorrow I'm going to scan it and see what it is. this is on the Explorer PCM so it might be a code from it. I am hopefully going to change the transmission modulator at lunch and eliminate another potential place for vacuum to leak. I put a vacuum gauge in the truck and I seem to be making a decent amount of vacuum. And a brake clean spray test didn't change my engine vacuum at all. I'm getting even more pissed now. This stuff is making me cross, I can't take this unsolvable high idle issue anymore. I'm thinking of changing out the IAT sensor too but I don't really see how that could change anything unless it is what makes the FI system choke.
I'll post up pics and let you crew know the latest update in detail sometime when it isn't 1AM.