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misfire

  1. Engine Performance
    I have a 07 cruiser with 200,000 miles and I replaced the plugs with Denso iridium plugs and denso coil packs. It ran great for 2 days. It started shuddering Than it showed P0306 (cylinder 6 misfire) I replaced that plug, it ran fine for half the day. Than it shuttered and showed the same code...
  2. Engine Performance
    Good day all - first thanks to this forum and members for being such an amazing resource over the past year :cheers: There's a lot going on here so I will try and format this as clearly as possible. I know I'll probably miss some info so please just ask and I will follow up. Backstory/Vehicle...
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