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Hi, I have a 2004 Suzuki Swift 5spd manual RS415, have recently had to change the accessory belt to do so removed the air-box and maff assembly to make more room. Since putting it back together the idle fluctuates on slowing down (ranges between 1200-1700rpm) then once completely stopped it sits at 2000rpm. I have checked all the sensors, the EGR, IAC valve and for vacuum leaks and nothing. have replaced the battery as was over voltage but still has not improved. Thoroughly cleaned the throttle body and replaced 02 sensors as well. I'm at a loss as to what could be causing this. I did notice that when I had my scanner connected the after the closed loop cycle finished the spark advance shot from 13 to 23 and the idle shot up with it
 
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