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1,252 Posts
I have a 2000 mustang and on cold start ups there is this weird sucking sound but its not continuous, it almost pops in and out. It is very noticeable on start up and at idle and when I rev it but after it gets a little warm it goes away. It sounds like its coming from the left side of the motor. I don't think it's a hose just because it stops after a few minutes and it doesnt idle terribly rough. Gasket maybe?