I have a 94’ LS400 had a timing belt and starter plugs and wires caps and routers all replaced. Car drives fine for 2-10 minutes when stopped at a light and I go to take off slightly giving it gas check engine light comes on and shows code52 knock censors replace knock censors and harness and still pops up has anyone had this problem need help.

First I had no codes car was running fine. Replaced water pump and timing belt and replaced wires and valve cover gaskets. After that code 52 popped on and I could not figure out why. So decided to change the knock sensors and harness wire and starter. Still code 52 pops up but we noticed it pops up only when I slightly excellerate or check engine light comes on and slightly excellerate. Can cut the car off and runs 2-5 minutes and does the same thing. Can always turn it off and drive a few minutes before it does it again. I remember someone had similar problems and was taking there’s to the dealer. If anyone knows what could be wrong please give me ideas. I checked the ECM and it’s ok. Also changed the rotors ignition coils and everything else still doing the same thing. Suggestions are welcomed.
thanks!