sorry I haven't read all the post,,no time... but if you are concerned about the 1200 idle , I had this problem after having battery disconected. It was pointed out to me in the front of the FSM about resetting idle.start engine , run 5 min. click off and run another 5 min. Each time you do this the idle goes down about 100 rpm . got mine between 700-900. mine goes up and down a bit like a vacuum leak , but that's mine.
sorry if this isn't what your talking about , i'll delete it later..

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.