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2004 Optima 2.4 EX, 2005 Yamaha R1 (street) 2001 GSXR 1000 (track)
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Well I guess it all depends on what you are used to (or rather, what you normally drive). All 4 cylinders will idle more rough than a 6 or 8 cylinder. The 2.4L engines have been great. I always thought the idle was a little rough and noisey in my opinion. But on the other hand, my Optima is the same way. It's tough to tell if the rough idle you're experiencing is normal or not, but my guess is that it's normal and the dealer will find nothing wrong.
 
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