Re: p300 misfire detected
Have you brought your Aveo to General Motors? Cuz my 2004 Aveo used to have "hiccups" (the RPM went unstable when it reaches 1500-2500RPM) problem on the engine and I already did all the things you did and it didn't make any effect. I asked the dealer to reset the ECU and all the sensors using those genuine scan tool from GM and those problems just dissapeared.
Or check your electrical parts (alternators, battery, cables, etc.)
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