Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
There is a knock sensor issue with many LS1 engines. Mainly code P0327 low input. Many (including myself)have replaced both sensors and harness,
but to no avail. Code still comes back, or never goes out. Any thoughts about a resolution?
My experience with 5.3L knock sensor codes is that OE sensors must be used. The popular and cheap option (starts with a 'D' and ends with a 'orman', a.k.a. NAPA Solutions) does not generate enough amplitude during the invasive knock sensor test to make the PCM happy.
