Hissing sound when running

[Ofnarcr]

My car(90' olds eighty eight royale) is making a hissing sound when the engine is turned on. It sounds like it is coming from the general area of the back spark plugs. When i turn the engine off it hisses and then dies down within about 2 seconds. We just replaced the spark plugs but my grandpaw kinda laid on the engine while puttinb the pesky back plugs in. Dont you think that if it was a spark plug the engine would knock hard?? That what my mom says but i still think it could be a plug that was forgotten to be tightened.

I donno what do you think??

[auto trainy]

It sounds like you broke a vacuum line on or near the fire wall or the rear portion of the engine.

[Ofnarcr]

What would cause that. We didn't touch that area. hmmm

[auto trainy]

Sometimes because there dry it doesn't take much to crack them,if you listen closely you will find it,good luck.

[Ofnarcr]

I still cant find it anywhere. Too many hoses and wires are there to single it out.. Im not sure what to do.. Hmm

[Ofnarcr]

I can hear it coming from the general direction of the steering thingy lolz.

[KRSEB5]

spray soapy water on and around the vacum lines
that will cause the one with a leak to bubble

[Ofnarcr]

thx i think i found it.

[auto trainy]

So ,whatcha find?

[Ofnarcr]

hose was loose