Change your spark plugs, your wires, cap distributor and rotor. I'm pretty sure your problem is there.This just happened to me. Before you change your plugs, wires, and cap, try this first. Pull the cowling engine cover off, locate the ignition coil and try to start the engine. Look at the coil and check for arcing. Race the engine a little to see an arc. I replaced the coil, and the problem was solved.
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MR GASKET IGNITION COIL COVER, CHROME, UNIVERSAL -- Made from steel; Will fit most horizontal mount ignition coils; Includes chrome plated mounting bracket
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MR GASKET IGNITION COIL COVER, CHROME, UNIVERSAL -- Made from steel; Will fit most horizontal mount ignition coils; Includes chrome plated mounting bracket