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Message: <blockquote data-quote="onebadatitude" data-source="post: 2508444" data-attributes="member: 857812">Engine light is not coming on. Trying to fix a rough idle problem and would the idle control valve, map sensor or the throttle body sensor throw a code if any one of them was not function correctly? Any simple way of checking them with a meter to see if they are within specs?   1997 Nissan Altima 4cyl,  AT, federal emissions Rough idle, is not stalling, seems to run fine except for rough idle condition- any suggestions appreciated</blockquote>