Good evening, car Fiat Punto 1.2 8v mot 169A4000. Engine control light switching on and power reduction. Diagnosis: no ignition on cylinder 2 and no ignition on cylinder 3 P0302 and P0303. Replaced ignition coil with associated spark plug cables and spark plugs. During the road test the phenomenon recurs in the same way. When the car is restarted or the errors are cleared, it returns to normal operation until the problem reoccurs.

Thank you