try this. i would first assume it is a V6, at witch point i assume you have not tuned it up recently. perhaps the last time it was tuned they didn't change the one hard to reach spark plug. if i remember correct its behind either the alternator or the a/c pump. but it is a misfire.
give more detaile if you want more answers.
miles.
bought new or used.
when you bought it.
how its driven.
p0300 is multiple missfire/ random cylinders... What happened right before this happened? After a fill up, could of got some bad gas. I would check that first after that you have to look at things that afect all the cylinders..
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