Maybe you can get your hands on a borescope and do a visual check on the piston(s).
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Question
What should I do I’ve got the code P300 on my 2015 Dodge Charger hellcat and I’ve bought new spark plugs and move the coil packs around… then i got the P307 code, I switched the injector from cylinder #7 to another cylinder same problem… cars sounds ruff while idling n so forth. I’ve got the compression test done and found zero compression on cylinder #7 said the piston has failed… what should I do???? Help me save money 
