1997 Infiniti I30 knock sensor

hey whats up im having a problem with my car everytime im speeding with it and come to a stop the engine just knock, but if im drving normal not fast reguler speed limit it only knock 1 or 3 time but if im speeding and stop this bad boy just knocking like crazy if i put it on neutral i dont feel the knock help please i scan it it said knock sensor and IAT sensor are bad...