Just for sh*ts and giggles why don't you unhook the PCV hose from your valve cover to your throttle body. I did that and it ran sweet even if I capped them both off. I know you shouldn't do this, but if it helps it may narrow it down to a PCV/MAF problem.
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87 GT, BBK shorty's, offroad H-pipe, ASP pullies, 70mm T.B., Cobra intake, no smog pump, Windsor Jr irons, Comp cams 1.6 rollers, F303 cam, H.D. export W.P., Tri-Ax, FMS subframes, Battle boxes, SSM liftbars, FMS King Cobra clutch, mass-air conversion, 73mm C&L, 24lb injectors, BBK fuel pressure regulator, 3/8" no EGR spacer, and other piddly sh*t.
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