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You should read check engine code.
It tells you more than you can guess.
You can buy quality $1000 snap-on OBD scanner or $30 cheap one.
$30 will do good job. (you need to google after car tells you error code because cheap scanner shows only code but not meanings in plain English)
or you can visit local autozone and ask them read code for free.
unless you ask car itself, nobody will be accurate.
code p0303 refers to cyl 3 misfire detected ===causes engine mechanical fault--wiring--ignition/fuel system--injector--ECT/MAF sensor--ECM
code p0316 refers to misfire detected during start up --first 1000 revs===causes --engine mechanical fault--wiring--ignition/furl system--injector
the common fault cause is ignition/ fuel system and injectors so I would be checking fuel pressure and injector systems for clean and wiring connections are good especially on no 3 injector.
IT MEANS THAT ONE OR MORE OF ABOUT 200 FAULTS HAS OCCURED IN THE ENGINE OR THE EMISSION CONTROL SYSTEMS, AT THIS POINT U WILL NEED TO HAVE THE SYSTEM TESTED FOR FAULT CODES, KRAGEN AND AUTOZONE DO THIS CODE TEST FOR FREE, FIND OUT THE CODES AND WRITE THEM DOWM THEN POST THEM BACK ON THIS THREAD FOR ME TO LOOK AT AND GIVE U SOME IDEA OF THE PROBLEEMS U HAVE TO FIX