Well P0200 is a detected malfunction in one or more of your fuel injectors.
P0300 is multiple misfire detected.
I would guess that the P0200 code is causing the P0300 code so find out why you are having an injector issue.
Possible causes: check fuel and air filter, fuel pressure, coil performance, and injector performance. The coils and injectors need to be viewed through a scan-tool. Looking at live data and performing tests. Without it you can try to look at plugs and see if you can notice anything or use a devise that measures temperature. A cylinder that isn't firing will run cool. Good-luck.
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