Constant ticking in engine on 03' Runner

I am sure everyone has this problem, or so I was told. I have a 03' 4Runner V6 and it has a constant ticking in the engine everytime I accelerate. Has anyone ever found anything to fix this problem? I don't remember hearing it when I test drove the V8 but then some say that the V8 doesn't have that problem. I find it quite annoying. Suggestions?