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Late Dec 94 z28 manual failed for high NO. Had a bad exhaust leak and installed carb legal pace setter headers. Had new cat, new plugs before headers and passed all but nox

put in headers and new wires and the car runs 100 times better - kept all oe smog tubes egr ect all bolted up.

went to smog it and failed as a gross polluter for hc and co.

smog test and repair station says it sees sticking injectors and want to remove and clean.

I ordered a wideband Gauge to read before cat and have some idea on air fuel mixture

I have scan 9495 files after installing wires and headers if anyone can read them well. O2 sensors seem to be moving the way they should

any insight would be great

thank you

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