1993 Toyota Tercel DX Failed California Smog Test

1993 TOYOTA TERCEL DX

Almost 154K miles.

ASM Emission Test Results:

15mph: 1609 RPM, 13.8 % CO2, 1.1 % O2 326 PPM HC, 2.11% CO, 1099 PPM NO

25mph: 1742RPM, 15.0 % O2, 0.0 % O2, 78 PPM HC, 0.11 % CO, 679 PPM NO

No "Check Engine" light on. Car "hesitates" on the throttle in lower gears and speeds. (Stupidly) I didn't "prep" the car at all (driving it on the freeway for a while right before the test). This was a "test only" situation. Last year, I had to change the cat converter to get the car to pass the smog test.

Any help will be appreciated.