P0300, P0303

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.