I would suggest a rebuild. I just went through the same issue with my 85 Comp, could barely pull up a skier with 2 people in the boat.
I had 3 cylinders @ 108 and the other 5 @ 115. A tired motor will always run smooth at idle since it has hardly any compression to work against, but can be a PITA to get started sometimes.
Also, with a vacuum secondary carb setup the motor isn't creating enough vacuum to open up the other two plates so you are essentially running on half the cfm of air going into a tired motor....bad combo.
Last edited by Supra_Comp; 07-14-2013 at 11:38 PM.
1985 Supra Comp TS6M
351 Windsor - 240 HP
Velvet Drive - 1:1
Fully Rebuilt