Mike ,

You mentioned a gasket change . There are no leaking gaskets at this time . Was you referring to something else ?

Also , should I be concerned with the possible carbon build up ?

I just came home from using the car . I stopped at a store and was waiting for my wife . It shut off after idling about 5 minutes . I immediately hit the key and it started back up with no problem . It'* still a PIA .

Gonzo

I was referring to lower/upper intake manifold gaskets. Do you know if and when they have been changed out?

no flexible ratchets necessary to change the rear plugs, just some different size extensions. im not a big fan of the flex or wobble stuff. they will get you in trouble more than help