I already replace spark plugs,wirest,new fuel filter and new cat.. also i replaced two coils.. but my car still weird running as bogging/sputter/ maybe misfire? since i replace of them. anyone can tell me why i have fail smog?


Maybe could be

-faulty O2 sensor?

-Engine Coolant Temperature?

But i have no idea which one point is big problem...


Anyone can help me?

 

what kind of gas were you using? run 87 octane... and get that seafoam can from autozone for 10 bucks. run it in your gas tank. drive around for 30mins run it good and strong. then take it to the smog

 

do you have a check engine light on? if you have a diagnostic tool, you might be able to find out the problem from the code.

 

Where in SOCAL are you, If your near or in the Inland Empire I can help you out..LMK

 

Are your spark plug wires hooked up correctly? All vacuum lines hooked up right? Find out why your car is running rich first then check O2 voltage if its within specs.