I got a mercury Monterey recently the timing was set to 2. I set it to 6 and also adjusted the choke, mixture screws and idle screw and it ran smoothly for the whole day. Come the next day as I try to start it and it just cranks. I've checked the spark plugs/wires, cap/rotor, ignition module, and coil but they're all getting voltage. I went through the carb again and no matter the setting it won't start.