After driving 30-40 miles the engine starts misfiring, the check engine light turns on for all cylinders, and code p0300?

2013 MINI COOPER S
107,000 MILES • 4 CYL • TURBO • 2WD • MANUAL
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BHAMDOC1973
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Car drives perfect the after 30-40 miles it starts misfiring and check engine light comes on for all cylinders plus p0300. You delete it and everything is back to normal. I changed the PCV seal because it's common but that was not it, i guess. Spark plugs look good.
Aug 3, 2022 at 9:58 AM
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STRAILER
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This can either be a dirty or worn out MAF sensor or the fuel filter getting plugged up which is in the tank. You can try to clean the MAF but that sometimes doesn't work here is a guide to help you also I have included the MAF location and how to change the fuel filter out.

https://www.2carpros.com/articles/mass-air-flow-service

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Aug 3, 2022 at 4:33 PM
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BHAMDOC1973
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107k hard to believe a filter is bad, but i will clean the MAF first and see. Thanks
Aug 3, 2022 at 4:46 PM
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STRAILER
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You may have gotten a bad tank of gas which can take out the filter. Also, on the MAF sensor cleaning doesn't always work but it is worth a try, let me know.
Aug 4, 2022 at 6:35 PM