My Honda Civic drives very well but if it is left for more than 3 days it won't start. Also can stall quite a lot and kangaroo until the engine is warmed up, then its nippy and responsive. Any views would be much appreciated. :D

. Replace fuel filter:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563-2.html#post224689

. Replace spark plugs (NGK only), spark plug wires, distributor cap, and rotor, if they have not been changed recently.
. Replace Ignition Control Module and coil:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563-4.html#post265896