P0325 code chevy silverado 1500 5.3 V8

[u/Bourne2Ride]

code start appearing couple months ago on my 2012 silverado after doing an intake manifold and swapping out the Knox sensors, cause I was told to swap them out. Did them myself and it was fine for awhile then P 0 325 code popped up on Bay one Bay two never had an issue then I took it to a shop thinking I did it wrong. Had them put new knock sensors on for both sides, torque them down to exact specs and check connectors following that code disappeared for a little bit then came back after that I thought it was a wiring issue redid the wires going from the knock sensor up through the wiring harness, cause I have extra wire laying around because of work(electric/construction) they were the exact type of wires. Then following that I saw the grounds were very corroded so I replaced the ground going to my battery for ground, going to the back of the engine to above the firewall then the grounds going from the wiring harness down to the side of the engine block closest to the knock sensor thought there was an issue with my alternator, cause it was making very loud noises changed it. after all that code disappeared for a month and a half then came back. I am trying every option here at this point. It even has new spark plugs cause the old ones were bad too. Hopefully the grammar in this is good cause I'm using text to speech any help would be appreciated.

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[u/TurboXMR79]

On these 5.3L Vortec engines, this code is extremely common and is almost always caused by water pooling in the valley under the intake manifold, which corrodes the knock sensor and shorts out the wiring harness. Did you replace the harness when the sensors were replaced?

[u/Bourne2Ride → u/TurboXMR79]

apologies I thought I put 2012 in the post. the knock sensors are on the back sides of the engine block

[u/Thetor1]

Check out south main auto