sounds like my father when i tell him my truck needed some type of maintenance. "ohh well thats a new truck you shouldnt of needed to do that."
yeah, tell it to the part that failed.

 

Any other ideas guys on what else could b???

 

Sorry guys for the confusion,had to bump this thread for some help

 

........

 

I highly doubt it's your o2 sensor.

I'm running w/o an o2 sensor with a 5.0 and get wayyyy better mpgs than that

 

So what else could it be?? Yesterday I jus revved it to show how horrible she was and jus by doing that my needle moved so that showed me i couldn't have my handbreaks on,I already changed the plugs...and idk for what year the imrc came out,I highly doubt it could b my cats or sensors bcuz my truck has barely 42xxx miles,what else?!?!?!?! Idk what to do,I'm thinkin of selling it if I can't fix it,I'm stumped

 

You've been told a few times to set the tune back to "stock" settings, and try that; this will eliminate the special "tune" you installed as the culprit. You continue to bump this thread asking for help. Have you gone back to the factory tune yet?

I'll agree with you that 42K on the odometer is low mileage for sensors and cats to fail, giving you such poor mileage. This is it has been recommended you go back to the factory tune on your programmer. Basic troubleshooting suggests you step back and look at what was done BEFORE the mileage became bad. This is what you mentioned you did:

Tuner
spark plugs/boots/wires
CAI

Did you gap the spark plugs properly? Too large a gap can cause a weak spark, with poor performance and poor gas mileage.

Remove a spark plug or two and check their gap. If the gaps are good (within recommended range), then remove the performance tune and set it back to stock, then re-check the miles per gallon. Then report back with your findings. We cannot help you anymore until you check these items.

 

Fixed this waaaay back,found out how to fix it thru a Chevy forum,so much for the help on this dam site,turns out theoil from my knn filter dirtied the maf sensor cleaned it and problem solved,thanx for nothing yall

 

Just cause you were confusing everyone and throwing a lot of useless info into the mix doesn't mean it's our fault. I know I had nothing to say to this as it was too late to comment, but from what I've been seeing, a lot of these guys know their *****. Try syphering the problem a little more before going ape***** on here demanding the answer.

 

please go back to school and learn how to spell before trying to insult this forum. we do not speak "txt" here. and if you would actually tried anything the people suggested, the maf would have come up next. we would also of been alot helpful if you actually tried anything you were told to try. thank you for your forum patronage in bringing up a four month old topic just to insult us. good day sir.