Ever since my check engine light popped on my idle has been finicky(randomly shaking a little bit and fluctuating from 500 to 2000 rpm’s). Does this sound like this is from the knock sensor itself or could it be something else causing my car to throw this code? I appreciate any help I can get

 

Need basic info like year, mileage, maintenance history. PO330 is the only code? 500 to 2000 is once heck of a range more inline with a vacuum leak than a bad knock sensor.

 

it could be a bad fuel pressure regulator