Emissions failure

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Guest
Im failing on emmisions on 96 march, getting .8% on CO on high idle (2800RPM) it's fine at idle, anyone have any clues, there is a new set of plugs in there, im hoping it's not the cat, perhaps it's the lambda sensor?
 
Clean all your Air filter. Get all Mess out of it all oilly disposit and that all your air hoses are clean. Cheap and can make a difference
 
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