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When I am idling at a stoplight, once in a while, I will feel a slight surge forward, like someone has tapped me from behind. Any ideas on what this could be? I sense it is engine related..

MDXDRIVER
 

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I agree, when the A/C cycles (and it runs with heat, too) the idle advances slightly to make up the extra load of the compressor. Keep your foot on the brakes!
 

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Surging while ideling

This Am after starting my 2002 MDX. While it was idling in park the engine would surge up and down between 1800 rpm and 600 rpm. If I would shift into gear it was OK.The temperature outside was around 15 degrees. Any ideas as to what is causing it?
 

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mine did something similar took it to dealer they swapped egr valve out. it was idling eratic only when stopped at light or in parking
 
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