Hello, i recently replaced my starter because car was not turning over. After completing the job
I went for a test drive and i noticed that the acceleration was sluggish and car would shake when shifting to the next gear. I checked the codes and got P0300.

 

Double check your work. If it was fine before the repair, it sounds like you might have created a vacuum leak as that error says random misfire among most if not all of the six cylinders.

So whatever it is, fuel, spark, or air, its happening to several cylinders. Hopefully it's something obvious.

 

Problem seem to fix on its own in the morning. thank you