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Laozong: here are a few questions and suggestions (even if they do not cure the problem they will not hurt, and MIGHT help): What grade/octane gasoline are you using (you might want to try the next-higher grade); even though you cleaned the throttle body, as I recall once you remove the TB, there is a small hole, where the throttle was attached, that needs to be cleasned out as well; also, some have mentioned that some TB cleaning materials are not as good/clean as they should be, maybe even leaving small amounts of meatal behind: perhaps a thorough re-cleaning is in order; have you checked the oxygen sensors? Air Mass Meter (IF you unplug the AMM, do it only with the car turned OFF, then run the car without the AMM plugged, see what happens: if you have a harmonic balancer (2-part pulley, with rubber vibration dampener between the uinner and outer pulleys, the rubber might be starting to deteriorate, allowing the pulleys to spin at different speeds, which would affect timing/combustion: paint a straight white mark, from the outer pulley to the inner one, drive your car normally, then look at the mark to see if it is still a straight line: if the mark is now 2 short unaligned marks, that is a possible cause of your problem; Haave you pulled each spark plug out, checked for oil, excessive carbon, etc? Have you thoroughly checked and cleaned the PCV/flame trap system, including the little nipple/connector on the larger PCV hose? Your muffler MIGHT be the problem, but so far I believe that following Chris' suggestions, and mine, might lead you to the answer. Happy New Year (Gung Hay Fat Choy?)--PD.
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