its been a problem since LS motors went in trucks in late 99, i assume its because the engines sit at an angle in the trucks as compared to the cars, could have something to do with the intake aswell.
as long as you take the foam off and use RTV on the sensor plugs you shouldnt have a problem with them again.
i havent seen one with the top rusted off like that, i could see that sending a false knock signal to the PCM and pulling a ton of timing, but i'm still skeptical.
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