Just looking for some advice on why my check engine light is coming on(it came on for 24 hours went off for 48 then on for 24 off for 12 and has currently been on for the last few days). I got a scan tool and it gave me code po300 misc. engine misfire. Just wondering if the fact I put a fuel cleaner additive in the tank as well as filling with premium 98 oct could cause this? Im also wondering if my old spark plugs(close to 5years) could be a cause? I plan on changing them just haven't had the time yet.
Thanks,
Pete
P.S 2010 mazda 3 sport G.S 2.5/6speed manual
Thanks,
Pete
P.S 2010 mazda 3 sport G.S 2.5/6speed manual