Smells like stator. Same shit mine was doing. I checked EVERYTHING before I replaced my stator. It started & ran great up until WOT(Wide Open Throttle), then it would spit, sputter, backfire...shit all over itself, but only at WOT.
$140 and a new rickystator stator on an adjustable plate, advanced the timing 4 degree's & Shee is screamin!
Have you tried disconecting your TORRS? Still have E-brake assymbly?