also, do you think that the 2 problems (1. engine stutter/low idle and 2. knock sensor malfunction code) are isolated, or do you think that one caused the other?

 

^^ ?

 

I think it is all related to tha Bad Knock sensor.

 

^^ i guess i just need to get to it and see what the problem could be/replace it. but i'm having a super difficult time getting to it

 

On a lift, it is a reach. It is under the intake manifold, on the engine block. About 1/2 from front to rear and 1/2 down. I have never needed to replace one, but I have had my hand on one to see if it could be done. There are some hoses in the way, but they seam to be flexable enough to move them enough to get the job done.