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ignition miss

  1. Weird miss at 4500

    Factory Five Roadsters
    I give up trying to solve this myself. After installing new heads (AFRs), and being really pleased with the HP increase, I discovered that once-in-a-while, when putting a heavy foot on the accelerator, it will miss and sputter at about 4500 rpm. If I back off of the throttle a bit and then...