[87stang 5.0]

I have a 94' cobra and when i am turning the engine off i can hear a sucking noise kind of a hissing noise, i have a denscharger CAI but it never made that noise before i did a tune up, also the idle is pretty poor. any suggestions?

[Bullitt95]

The hissing sound could be soming from either the upper radiator hose or one of the heater hoses coming off the water pump. Check the hoses and tighten the clamps if necessary.
As for the poor idle, try disconnecting the negative battery cable for 15 minutes or so to reset the computer. You might also wanna make sure the CAI connections are secure and leak-free.

[Julian Moore]

Pretty normal sound with a good cold air kit. You should here the sound on my Expedition. I would open the hood, have a friend shutthe car off and verify where the noise is coming for.

[texstang65]

yup, I just built my own CAI using stock MAF and it takes a deep breath when it shuts down...I thought that was cool...LOL!

Just my girl Trouble panting a lil after we go play...