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Its been cleaned not even that long ago. I have a feeling its everything, Motor, cats, egr. Motor probably has over or approaching 300,xxx
Cleaned at the intake manifold port ?? or the EGR itself ?

NOx is formed by high cylinder combustion chamber temperatures that combines the Nitrogen and Oxygen molecules .. overheating engine, or a non functioning EGR will cause this .. the EGR displaces the oxygen / reduces fuel, so you dont have as much nitrogen / oxygen burning inside the engine to form NOx. The Cats dont really do much for NOx reduction.
 

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What were all your readings? That will help us figure out where your problem lies. As of now, I'm still thinking a problem with the EGR system though.
 

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WOT Junkie and avid corn burner
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3,734 Posts
PI intake manifold swap...EGR problems solved. The '94-'95 EGR system sucks a fat one.
 
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