I’ve walked in OP’s footsteps and have been guided by the same advice by people on here. I’m just someone who likes to learn and by no means a mechanic. When I first got my K5, it had very hard starting but seemed to run fine after starting. I changed the cap, rotor, plugs, and wires, and that made a huge difference. The rotor contacts were brittle and literally dissolved when I pulled apart the assembly— I’m surprised it ran at all. Since then I had an episode of problems a lot like yours, which mainly showed as the vehicle wanting to die while going uphill. It did die twice. I always had to mash the gas pedal to the floor to struggle up a hill. A filthy carb-mounted fuel filter was the cause. Then my hardline fuel line, just before the carb, developed a leak, probably from me not knowing what I was doing when changing the filter. I ended up cutting off the metal line and splicing in a section of rubber hose. She still doesn’t always start easily, so this year I’m thinking of a carb rebuild as well. And a switch to ethanol-free as even the so-called helpful ethanol additives seem to not do much. I’m suspecting something is wrong with the carb as it seems I’ve solved all of my other problems. Thus, eagerly following this thread.