End P0300 Woes A Comprehensive Guide to Code Resolution

I've been getting a p0300 code lately when the car goes over 2300RPM. The tachometer appears to studder when these misfires happen and SES light flashes. No ... It is very likely that you have an excessive amount of Black Carbon and Greasy Gas Gum built up around the Valve Seats. I am working on my daughters 2003 ZR2 with around 150k miles.I am dealing with the Dreaded P0300 code. I have the flashing service engine light, car runs OK. The P0300 trouble code indicates an issue related to engine misfires. Misfires can occur in any of your vehicle's cylinders, causing noticeable performance ... When the code P0300 is set in the Power Train Computer, it means that the Misfire Monitor has detected more than a 2 percent variance in RPM ... P0300 - Random/Multiple Cylinder Misfire Detected · Navbar Menu · P0300 - Random/Multiple Cylinder Misfire Detected · Footer. P0300 means two or more cylinders are misfiring. While you are not getting codes for specific cylinders, many diagnostic tools can pull the misfire counts. The issue is either O2 sensor related or possibly failing/weak fuel system components. Will eventually check head bolts regardless of O2 outcome and plugs will ... A P0300 can be caused by SEVERAL different things, ranging from bad gas, bad plugs, bad coil packs, bad/dirty MAF sensor, bad MAP sensor, lots ... I have P0300 code, which is a random misfire. I replaced all the plugs with NGK platinums and gapped them correctly at .44". I tested all of my coils, and they ...