81 gtv6 dist problems

[81usgtv6]

after almost 1500 miles of so so reliability. The alfa gremlins are back in force!!!
13 miles to the gallon (speedo way off). Super hard warm starts. No accelaration till 3 grand. The vacuum mech on this puppy has 2 lines and does not do what it is supposed to do when you pull off the upper hose. (advance to p/f. it retards ~20 deg.) The diaphragm holds a vacuum on both lines. There is no play in the dist bushings. Less than 60000 miles on this beast. I guess sitting in the woods for ten years with a tree growing through it made it cantankerous.
I could use some good advise on this one. thanks