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My 6th cylinder is misfiring and I don't know why. I have replaced the spark plug, plug wires, coil pack, and fuel injector and it's still misfiring. I have had it looked at by a mechanic and he told me that before the cylinder misfires there is power going to the cylinder, however after it starts to misfire it loses all power going to that cylinder. I can let the car sit for a little bit and start it up and it will run fine, as soon as I start driving and making it work that's when it misfires. What do I do? Code that comes up is P0306 I believe.