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Posted on Jan 02, 2017
Well, the code simply means that the engine has... a random misfire. As to why, that's going to take some work. Is it fuel, timing, compression, or electrical? I'd start with a compression test. Then throw a timing light on it, check for play on the valve train, run some fuel cleaner through the tank, and check your electrical connections. Hopefully, something will pop up. Good luck!
Posted on Nov 23, 2008
Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300
Posted on Dec 15, 2008
First start by making sure that the spark plugs are AC Delco plugs or other WILL trigger a P0300. If these are good, the next thing to check is the coolant temperature sensor(ECT). If this is problematic, it will cause too much fuel to be delivered and misfires to occur on all cylinders.
Posted on May 09, 2010
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