My micra is only running on 2 cylinders? pulled the spark plugs strong spark on each one. 2 spark plugs are wet with fuel which is the 2 that the engine is running on. The other 2 spark plugs are bone dry absolutely no fuel getting too those cylinders. Im getting pulse at both injector wires so im wondering do the 2 injectors need replacing? or can they be cleaned or fixed if they are stuck closed?