Opinions needed.

[frontman]

Original post is here. Can't hyperlink from iPad so sorry for long post... http://www.naxja.org/forum/showthread.php?p=245580334#post245580334

 

[blondejoncherokee]

hi Nox is probably lean due to high combustion temps. if youre doing the cat that wont hurt but if its still lean it could be another problem. have you thrown a voltmeter on all the sensors to make sure nothing weird is going on? id bet a new cat will at least get it to pass this year then you have 2 years to figure it out

are you sure the TPS is good? crank shaft sensor ? new cap, rotor, plugs, and plug wires?- slight misfire maybe?
CPS controls timing , did you notch out the CPS and move it over?
id sea foam it before you replace the cat .
clean all grounds and all sensor connections for fun
got any vacuum leaks anywhere?

running crappy fuel?

from some website:
Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage- thermostat?
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections