same thing buddy, but mine is only noticeabul at idol.... i will show you a pic of that he is talking about.... yes its a few $$$$$ to fix!
http://arrc.epnet.com/autoapp/8682/c.../86823pu2L.gif
have you tried putting 91 octane in the engine? may help it run a bit better... or seafoam?
SEAFOAM
EDIT! that reminds me! i put half a can in my engine oil and did that about every other oil change and i dont have my ticking anymore! try that, or see what other people here think about seafoam
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Never ask a girl if shes sick, she might not be wearing any make up. - lets just say she went storming off.
Never tell your wife she looks tired, they tend to hit and say that means she looks ugly. (weird logic i know)