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Q: SES light periodically comes on.P0300 B0226 B0222 on 1999 Chevrolet Suburban 1500

P0300 B0226 B0222 AutoZone reading yesterday
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po300 is misfire codes and the other 2 are not listed in all data. i think the guy could not read b codes with the cheaper scanner and got ghost codes a P300 means...what is the usual cause of the Po300 and why would it come and go?
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