Recently at stop lights my Mustang starts to rumble and the rpm's begin to drop and my car dies on me. If I rev the engine it wont stall. It doesn't always stall though, just some of the times. I can sit out front of my house with the engine running and it feels like it wants to stall, but it doesn't. Then I can just be at a stop for a minute and it will die. I am not mechanically inclined person, but I was inspecting my car and underneath I noticed a piece of pipe that was missing a section. I am curious if maybe this could have to do with the stalling. I have attached a photo. If anyone can tell me what this pipe is and if it has anything to do with my car problems I would greatly appreicate it. Thanks in advance for any help.
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