There is nothing major wrong with your car. Was your cat good and hot? This is the most important thing. Unless the cat has been replaced, I would say it is down to 10-15% efficiency.
Run some injector cleaner though it, run at high speed for 20-30 miles. Gas up with new before retest.
Check plugs, gap, condition. Check wires, resistance. RorR air filter. check for vacuum leaks before & after the intake. If possible scope the O2 for sluggish response.Check timing.Check coil that its hot enough. Lastly, check EGR ( if equipt) for flow constrictions. ie carbon build up.