Where is the knock sensor at?

Cool I didn't think there was a knock sensor. It is wierd that my car ran that poor on 87 octane. I heard that running 87 octane is supposed to make more power.

I know one possibility is that my timing light could be inaccurate also. I set the timing on a friends car and another guy checked the timing and said it was 8* off. So I should look into that first.

Thanks,

Jason