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Message: <blockquote data-quote="VectorX2" data-source="post: 1063385481" data-attributes="member: 99968">here is what my problem is....when my car came out of the factory without any modifications... after it's first service, it's idle speed originally 600 rpm increased to 900 rpm, automatically...then after a year driving... once in a while the engine shakes during idle... can feel the vibration throughout the whole body... but after a while idling the vibration stops... or when the aircond compressor runs, the vibration stops too...after i changed the air filter to drop in and changed the exhaust, with the catalyst converter removed, each time it shakes, white smoke comes out of the exhaust, the exhaust becomes clear as soon as the shaking stops...recently when i changed installed adjustable cam pulleys and and adjust the cam timings, the shaking dun just come once a while anymore, it shakes every time i idles when the aircond compressor goes off....i wonder is this actually normal, or sumting when wrong in my upgrading process? or the engine already have a problem from the begining?</blockquote>

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