Tighten your spark plugs. This happens to me about every 2000 miles, the tr55s I have start to back out and make the same ticking noise on and off, some times worse than other times. The ticking gets worse with acceleration then goes away after more acceleration because the car drowns out the noise.
It baffled the hell out of me since it started after I did headers, and I band clamped and tightened everything everywhere and the header bolts thinking it was exhaust leak.
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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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