Replacing both DISA sensors and cleaned the intake manifold did the trick. Car runs perfect now. Since I was in there, I ended up replacing all the gaskets for the IM as well. At 155K, there could be a high probability that the plastic has fatigued. My larger DISA flap must have broken sometime ago and it finally got lodged into cylinder 6 causing uneven air fuel ratio to cause the misfire. This is exactly what happened to me. Hope this helps.
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