So i went to 7 eleven this morning, and my truck is not running right at all. First, it idles super low, and i have to keep the R's up because sometimes it would die. Second, It sputters real bad between idle and 1750 rpm, and it supttters less from there up. Third, theres a lound hissing noise (like air escaping) when the R's drop, and when i accelerate.fourth, its throwing 3 codes, bank 1 sensor 1 too lean, bank 1 sensor 2 too lean, idle control too low. Need help on this ASAP, thanks

 

Sounds like a vacuum line may have popped off. Open up your hood and check those out first.

 

Sounds like a vacuum leak, could be idle air control valve, could be mass air flow sensor. check those and the connectors. That's what I had to replace when my truck was throwing the same codes, but mine wasn't running that bad.

 

x2 on this it has happened to me several times lol

 

the code is actually bank 1 o2 sensor stuck lean, and same on bank 2. No i just gotta find the line if thats the problem. i dont see any unusual fluids so thats good i guess.

 

You make more vacuum at idle, than at higher load due to the throttle plate being open.
So if it runs better as you rev it up, then it sounds like vacuum connections need to be checked.

It sounds like you got a nice sized one, that happened to me when I accidentally left the brake booster unplugged.

 

Vacuum leak. 100%

 

i got it. it was a big vaccum line right below the intake manifold up against the firewall. runs like butter now. Thanks guys for the help

 

I would try to find otu HOW it came off, and prevent it from happening next time!

 

ya i put a hose clamp at the elbow, its not goin anywhere

 

anytime you hear a hiss its vacuum somewhere.. problem is if its a small leak you wont hear it over the motor