clear noise

I'm outputing signal in arduino in pins 3 4 5 6 7 8 one after another with a specific time delay
I'm sensing the output voltages, and I see that each pin feels kinda noise when the other pins are outputing
is there anyway to "clear" that noise ?

What do you mean by noise? A logic pin is allowed to have noise up to a specified limit and its fine. How are you sensing this noise? Might you be picking up the noise by not paying attention to capacitive-pick-up in your sensing circuit?

Are you using the USB-bus for the 5V power ?
You could try an adapter (7-12V).