John-Reed,

Open the top of the AFM and tighten the spring up a notch or two.

What part are you failing?

CO or HC
How much over are you?

I would check the valve adjustment-too tight valves will allow the valves to
not full close at idle and in crease emissions.
Check vacuum leak sources.  Too much of a leak will not reduce the fuel
pressure to the low 29 PSI.

Check timing
Check for Temp II sensor is in spec
Check the O2 sensor
Run a bottle of CAT cleaner in fuel.

Robert