my 04 impala ss stalls when i first start it after its been sitting awhile i have to two foot it fo a few miles then it smothes out but it still runs ruff even then and wants to stall at red lights i notice i hear a possible vacume sound near the air box but cant find any thing i changed the plugs wires and air filter becouse it needed it any way and i am fixing the exuast leak in the resonator now when i scan the car i get random misfire and o2 codes witch i think are to be expected the car has a serise 2 supercharger on it does any thing jump out at any one and would a o2 make my car run like this for some reason i dought it and oh yeah i changed the fuel filter and the it reads 40 psi at the rail

Hissing sound near the air box sounds like the IAC is sticking open, thus the reason for it stalling.

if you had a bad supercharger gasket it would cause noise and codes, which code is it there are quit a few? how many miles? could be a cat, could be alot of things really depends on which codes you are talking about

i think you might be right i am on my way down to the garage to check, but fisrt do you think i have to replace it or can i clean and lube

the IAC that is

hey there is a black rubber boot around the throtle body with no fastener if i force this off will i damage it will i be able to put it back on with out it leaking

Can u take a pic of it?

so, it wasnt the iac i replaced it with a know good part and the problem is still there but i think that the problem may still be in that area like maybe i need to clean the throtle body it looked pretty dirty threw the iac port is there any thing i should watch out for when removeing the body

The air duct just slides off the throttle body. Its just press fit on there really tight. It should take both hands to get it off. Then, in the throttle body, you'll see the maf screen. There is a split ring holding it in, but it wont just fall out when you remove the ring. I buggered mine up a bit taking it out to clean my throttle body. I then realized it would have been much easier to remove the maf sensor from the TB and push the screen out from the rear.

My car was doing something somewhat similar and it ended up being a vacuum leak. Check all your hoses for cracks, splits, or pinholes. Unplug the maf sensor and start the car to see if it still has the problem to rule that out.

Loud