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Try removing the injectors and have them cleaned/ flow tested. You can also try using fuel injector cleaner.

Use the highest-octane fuel you can get. 91 FTW

Check the ignition timing! make sure the timing is within spec.

Before you get tested make sure to drive around at least 30 min and while you wait for the smog test keep the engine running! Use a OBD2 scanner to make sure no codes are present and that all monitors say OK. when it's time to smog the cat will be nice and HOT and have better chance at passing.

Good Luck!
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