I had a really bad miss fire under load and if boost hit anything over 4psi. I replaced alt, coil packs, re did grounds, re installed CAS, adjusted TPS to factory spec and none of that worked. I Previously when first swapped the sr gapped the plugs to .028 or around that tried gapping them wider and the problem got even worse so I re gapped around .025 and all boost problems under load freeway speeds are gone no bucking or miss fire. something that simple haunted me for months until now. Hope that helps.
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