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The lackn of power mid range is called the Torque Dip. All 86s had it. It's not broken, that's just how the engine behaves. If you have catless headers you need a tune specifically for that. Which stage 2 should be, but some people do have catted headers. The codes come and go because they aren't properly turned off for whatever reason. Your tune shoyld turn off the cat related codes because you don't have one anymore. The misfire is likely because you have the wrong tune loaded and the computer is trying to "fix" it, but can't.
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