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I bought a 15 Sierra 5.3 4x4 about 6 months ago. I started noticing a tick coming from the engine in the passenger side. I took it to midas the mechanic said these engines are known for the ticking sound and that it's nothing to worry about. I had them do a motor flush to see if it would fix it and it didn't change anything. I also used Lucas fuel injector cleaner and that didn't fix it either. Does anybody know if it's something I should worry about? Any suggestions?