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Did anyone figured the P0300 out? I am at 137k with my 2014 Cruze 1.4L and have already changed spark plugs at 95k with 3 new boots as they got stuck were deformed. I did install a new valve cover with bran new gasket a few months ago. It ran fine for the most part and couple days ago after high rpm it started misfiring. I cleaned the spark plugs with electronic cleaner and checked the boot coils for deformation or damage but nothing obvious. Really struggling with diagnosis here. Send help.
 

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Where is this " Coil Connector". I have put in a new battery, new neg. batt cable, new coil pack, new intake manifold (cause of STUPID CHECK VALVE FAILURE/MISSING), new spark plugs (irridium/oem type not coppers) New valve cover (PCM valve went out)and fuel injector cleaner and different gas. Now I still have p0300! and the crazy U0100. Any updates and help for me?
What did you ended up doing? I am a bit curious. I am kinda on similar route.
 
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