I have an 08 silberado 4.8. Installed cam, valve springs and long tube headers and ory. I have got it tuned already and it doesn't run very good and cuts out. Has new plugs and wires and the rear o2 sensors have been tuned out but I'm getting a misfire code and all 4 o2 sensor codes are kicking on. Any ideas

 

If the sensors were turned off properly in the tune there should not be any codes for them.

Was it tuned after all the parts were installed???

Was this a mail order tune or was it done in person???

What are all the codes you are getting???

 

if he shut the codes off, you shouldn't be setting them in the first place. perhaps a short?

 

I wouldn't think there is a short. Everything is done nice but I'm going to have my tuner go back over it again, just doesn't make since why all the cutting out.

 

blowing spark out? or is it a constant cut out sort of deal? vacuum leak?

its almost one of those things id have to see a log or see it in person

 

It's runs alright down the street. Just as u give it to much throttle it starts to cut out more but cleans up on the top end. Smells very rich also

 

tune issue is what it sounds like to me. the fuel smell can be fixed as well.

 

Ok we'll I'm setting up a retune with Justune right now to see what's up

 

i know its been awhile since a update on this problem but the problem was fixed with removing the metal spark plug wire boots. I guess them and the headers didnt get along to good. Also had the tuner triple check that the rear o2 sensors are turned off but I am still getting a engine light from them

 

what code?