4kq Smog Problems, ideas??

[JShadzi at aol.com]

Ok, my beater 4kq is having a hard time smogging, the HC topping out at 1900...Gross Polluter is 240ppm...

Is  this likely a leaky exh. valve??  The car has brand new plugs, wires, dist cap/rotor, O2 sensor, and CO is dialed in.  Only raw fuel could cause these kinds of numbers, anyone have any BTDT??  It has a bad stumble at idle, but disappears at higher RPM, noting I can do will eliminate it.

Anyone want to buy a parts car for $500??  ;)

TIA,
Javad