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a lot of info on this if you do a search.
FWIW, there are many things that can contribute to a car not passing inspection. I would do the following first:
1) make sure O2 sensor is operating properly.
2) make sure air/fuel mixture is appropriate (14.7)
3) adjust valves before inspection.
4) run a can of Techron or SeaFoam in a full tank before inspection.
5) probably most importantly, take car for brisk 30 drive before inspection.
All of the above will help immeasurably.
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STONE
'88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended. 
Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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