That's just one of those Mustang mysteries. Same reason some cars have problems after springs....some don't. It's weird. In any event, my guess is that the O2 sensors aren't heating up enough since the longtubes are placing them too far downstream in the exhaust.
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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s
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