I have an 83 GMC K2500 6.2 with 120,000 miles.I have put alot of work into her and I think its controller time, again!I''ve replaced within the past year cables ,batterys,Injectors,Pump,AG 60 glow plugs,and a gear reduction starter.She does not want to start when it sits for 1 hr or so.When I replaced the controller(NAPA) 2 years ago the glow plugs would cycle always at start .She starts fine when cold.So am I wrong to think the controller is going bad? This is the second one.If anyone can give me insight before I spend the bucks on a controler and harness to upgrade it to the 85 electronic system.I'd relly be grateful.PS the symptoms are the same as they were when I first replaced the controller