hello am having a problem locating the knock sensor

Question

my rpm get low every time i put it into gear like its gonna shut down. but you put it back in park it stays on and the rpms are good. i took it into auto zone and they told me it had 3-4 codes both O2 sensors, map sensor, and the knock sensor. i already replaced all of them exept the knock sensor cant find it it says underneath the manifold but nothing can you please help located?or an idea where.....

Answer 1

It's just above the oil filter on the back of the engine.