Hey guys and gals. I have a 89 toyota pickup 3.0. Been battling the damn code 52 🤦🏻‍♂️ i replaced the new pigtail and original knock sensor with brand new ones from the toyota dealer and that dint fix the issue. What should be my next things to check?

Dont know if this could cause that issue but yesterday while trying to adjust timing it staryed shocking me so i used my test light and had spark leaking from 2 and 5 so replaced the cap. And reset the code. engine sounds beautiful untile the code kicks back on. Dont hear any obvious knocking. Only thing i do hear a bit is exhaust leak by either the manifold or where the manifolds meet at the down pipe.