So my car makes this loud whine when its on but I didn't think it was the engine it self so I figured, to my opinion it was either the alt or the a/c comp. So I went ahead and took the belt off and started the engine good news it was the a/c comp. bad thing is I don't remember why but I decided to take the oil cap off and the car started to act up and just died. So I replaced the belt and the oil cap and started her back up everything was OK until I took the oil cap back off did the same thing just died, what I did notice it that when the oil cap comes off I hear the engine sucking air thru the oil filler hole is this normal with these engines?