Volkswagen Polo car turns over and over and then misfires and starts eventualy

Check basics like plugs .Also check leads / coil are not shorting due to dirt or damp .A common cause is the engine coolant temp sensor which lets the ECU know how much fuel is needed , ie more on starting .

Would agree with witting hams diagnosis also on that m/y distributor cap is it dry inside and in good order/condition.