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I would look at the fuel pressure under boost conditions. Excessive fuel pressure at the wrong time can cause misfire.
0.026 is a bit close for the plugs. If you run boost beyond 20 psi Iguess you may have to run the gap down like that, but 0.030 is a normal "street performance" DSM gap. You might want to try opening the plugs more and see if that changes things.
It may be that the engine isn't tuned just right, too, but I suspect excessive fuel pressure.
Rick
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