Will change the plugs and check the coils
Cleared the faults and took it for a test drive today. It drives well. No hesitation on acceleration and no smoke or misfire. Drove approximately 60 km. I then decided to check the brakes and floored the pedal. The brakes are very good. But the cel came on again immediately! Coincidence? Turned around and drove 60 eventless km back again.
Hooked it up again and the same codes were present: P 300, 301, 302 and 303.
It was stored for two years with little fuel in the tank. Any possible problem here that will affect bank 1 cylinders only?