welcome to the forum. Great o see another MT on here. Don't sell it,,,folks on here will elp you solve the problem.
That'spretty low miles ,,,,unless i was abused you very heavy duty MT isn't even broken in yet.
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!st thing to check out are the wires at the coil pack. Tere's 2 electronic filters on there and they comonly get cracks in the wires. My be cause of suden death and intermitant runing and not running withot obviuos cause.
I had coosion insie th main relay(under the kickboard on passenger side. Popped the cover off it nd had gen corrosion n one of the 2 electromagnet contacts i there. This doesn't sem to be a comon problem, I don't had the kickboard so snow and water may have damaged mine easily.
None of the above explain fast idle.
Tereare 2ile controls,,the electric ICS and a hot water controlled air valve thats not shown in the FSM. They can corrode inside washing out the expanding wax pellet that controls it. This will give you a contstant high idle.
Broken wires at ICS terminal...
TPSthat's not adjusted properly,,,holding the butterflyopen just a hair too muck.
I'll lets so of the real gurus on here o help,,,my laptop battery is giving me the dead warnning.
Again , Welcome
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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.