Knock sensor and idle problem

Okay so I believe this is my knock sensor (The gray plug)


And it's not plugged in, and I don't see what it plugs into? But besides that, is that what is probably causing my idol problem?

I start it up, and it idles fine. I'll rev it and it's come back down and idle. It's about 1k because I turned it up abit.
When I drive it for about 10 minutes, towards the end of that 10 minutes when I left off it doesn't want to idle and when I park it in the garage it has trouble idling and if I rev it up past about 3k it'll die when it comes down. Is that from the knock sensor not being plugged into anything?

 

[gramkrakr89]

The plug for the actual knock sensor should be attached to the lower intake manifold brace (If I remember correctly)

 

[AnotherNewb]

Quote:
It's about 1k because I turned it up abit.




Misadjusted BISS could be the cause of your poor idle. Or possibly a bad ISC you may have been compensating for.

 

How would I troubleshoot those problems though?