Both. I bet your accelerator pump is shot, your centrifugal advance is frozen and your vacuum pot is leaking. Is it a 1bbl? Look into Carb while motor us off and see if a healthy squirt happens when you move the throttle arm. If it does, look at distributor. Pop top and pull hose off Carb. Suck on hose to see if the plate rotates, if it does, hold suction with tongue and see if it holds vacuum, 2 down! You'll need to rotate rotor by hand. Does it turn a few degrees then snap back? That's your mech advance. All else fails, check timing first. I think it'll run decent straight up at 0 but consult year manual for spec. Damper can move over gimme so its best to degree it gut that's more in depth. Ported or manifold vacuum. Try ported first then manifold.