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2

Sounds to me like one of the spark plug wires isn't fully seated. I would check both ends of each cable and make sure they're fully seated. The engine code it produced should give you some idea where to start: P0300 - Random or multiple misfires P0301 - Misfire on cylinder 1 P0302 - Misfire on cylinder 2 P0303 - Misfire on cylinder 3 P0304 - Misfire on ...


4

Oh wow, there's definitely something funky going on with the electrical system. With regards to the P0563 and P0621, have you tried getting a live reading of the voltage from your scan tool or a multimeter when the car is running? My advice - get a decent automotive electrician on the case. Your run of the mill mechanic isn't the right person for the job ...



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