James, I've passed the emissions tests here in FL with my old f-body without evening having a cat on it with all the normal bolt on's, it passed with a little room to spare.

With a big cam, long tube headers, no smog pump, no EGR, nothing but a cat I still passed emissions.

Reseting the ECU shouldn't effect emissions by any margin that would cause you to pass or fail, especially with stock cams, the ECU will quickly make the proper corrections to the AFR from O2 sensor feedback to maintain a stoich/14.7:1 AFR, if you didn't pass there has got to be a problem somewhere else.

What part of the test did you fail?