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I got a P0303 First, tried to fix it then later got a P0300. Replaced spark plugs. Still got p0300. The car revs high on start up then goes back to normal idle. When driving I can feel it misfire sometimes when I step on the gas and seems like low power.
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Possible Ignition Coil Failure, move coil for # 3 cylinder to another cylinder, clear code)s), drive, check to see if missfire moved with coil position.
I did I swapped 3 to 1 and received same error. P0300.
P0300 stands for Random Misfire. Does the vehicle feel hesitant? Has no power? RPM's won't go past 2-3K when driving? We just had the same year Xterra that had a P0300, ended up with clogged Catalytic Converters. Around $400 with parts and labor. Other things that can cause random misfire is a vacuum leak somewhere in the system. A smoke machine can diagnose that.