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I have a 2002 Trans Am WS6. I have a vacuum fitting that has developed cracking that I need to replace. I need help sourcing a new fitting. My search has not developed anything
Is that rubber or plastic? The way its cracking, looks like a rubber hose to me. I'd pull it out to confirm, then pick up a piece of hose of the same ID & OD from the auto parts store. It might have a GM P/N, but I seriously doubt you would find that exact thing.
That is a rubber elbow for the PCV line. Quite common to crack there and, to the best of my knowledge, it was only ever available when ordering an entirely new PCV system from GM (no part of the system was available separately, except the valve itself). So there is no part number for that elbow by itself. Looks like GM has discontinued the assembly (#12590632), but it's pretty common for folks to replace that piece with some basic vacuum line available from any parts store. The boot for the valve often cracks too, and that's a bit harder to fab up a replacement without buying the complete GM assembly, but folks have done it and you can search this site for options to build your own PCV system with commonly available parts.
Lastly, it looks like Hawks Motorsports is selling a reproduction of this assembly, and it's cheaper than the GM replacement was when it was still available:
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2002 Trans Am vacuum fitting needed 
