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Does the ticking ONLY come on with higher rpm, or is it still there at idle? Have you ruled out the possibility of the air gasket leaking?
Pull the wires and reach back and check to make sure the plugs are seated tight. let us know how that goes so we can start to rule some things out.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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