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did you start hearing it after you shut the engine down? If so, it is the metal parts such as exhaust manifold, heat shields, cats, exhaust pipes, etc. that are making the ticking noise as they cool down. If you hear a slight ticking on top of the engine on either side, it is the injectors. Either way, nothing to worry about. But it the ticking gets louder with RPM, it is a valve tick...still not bad depending on the loudness of the tick. My bet is the quality of gas you put in has something to do with it.
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