ok. ? in my 3.8 camaro if im driviing over 55mph my engine makes like a loud ticking noise only when im doing over 55mph, but if i have my trans in OVER DRIVE it doesnt make that ticking sound when im doing over 55mph. so i thinking maybe EGR valve jw anybody else with any ideas of wat else that noise could be?

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Not sure why a EGR valve would cause that. I would lean more toward lifters.