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Michael DeClercq posted a topic in 1999-2013 Silverado & Sierra 1500Just wanted to say I cleaned my throttle today and I saw an immediate difference in the truck. everyone with a rough idle or a vibration at 900-1000 rpm should look into this. both were problems I had and after cleaning the throttle and intake my idle is so smooth I have to stare at the needle to see any movement. also if you look back at my posts I had a vibration at 1000 rpm or so and so far that seems gone as well, If there is any change I will update this post for future reference to anyone that reads this. by the way the truck is a 2009 Silverado 5.3 ext cab z71 with afm. hope this helps anyone else with those problems