it just failed passed co hc was supposed to be 275 limit but was 350 and the no limit was 3600 but read 7265. car was tuned up 6 months ago cat isnt a year old yet and just changed the oil last week. any thoughts? it is my 87 lg4 carb car.

 

Considering you co's were ok and your hc's failed i would check to make sure your not lean. Especially considering your nox was also high. Faulty egr componants could also make your nox high, so check that out too.