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P300: obd II..Random misfires with intermitent stumbling of engine>

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I have obd II code p0300. Random misfires with intermitent stumbling of engine> where can I start to fix this?
Welcome to just I'm here to help you and your 100% satisfaction is my goal. Checked the wiring very carefully and the connectors at the map sensor that's the manifold pressure sensor,GM has determined that the wiring inside the insulation may become broken a
couple of inches from the MAP sensor
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