Start from the begining, Check your coil connections,check the plug wires are in the right order and fully connected,wires don't have any burns spots in them. You have to elimnate some of the variables from the situation. Guessing will get you frustrated and usually doesn't work. Don't assume anything. Start from the plugs back. Any plugs fouled, insulators cracked,what's the cap and rotor look like. Set the timing accurately. To me that means a light. You MUST go through it in a methodical way.