Ignition Problems:
1. Warm the motor and idle it at 1,000 t0 1,500 rpms.
2. Using insulated gloves and pliers, pull one wire at a time from the distributor cap then replace it.
3. If the motor slowed noticeably, that is good. If it did not, note the wire position and continue on.
4. If TWO wires did nothing, interchange them and see if that helps.
If you had just one cylinder that did not respond, replace its plug and wire then try the above again.
Carb Problems:
1. Warm the motor and idle it all the way down.
2. Gently turn each idle mixture screw all the way in and note what happens: If the motor keeps running--and picks up, even--the carb is flooding. If it slows and dies, then the carb is okay.
Try the above and get back to me.
Jeff