From the sound of your description..and follow ups (which gave a lot of good info, I'm almost about to not post and you'll diagnose it in the next couple days the way you were going..lol)
Ticking is likely an exhaust gasket leak. Your description is what nails it.
The trans codes for the manifold pressure and TCC etc.. Sounds like you want to check that wiring. If it's not the wiring, then you are having some trans issues that'll require a reasonable amount of work. Most shops would automatically aim for a different trans or a rebuild.
