I did this recently and I asked a mechanic the same question. He said that if I have been noticing any surging then I should replace the regulator. It is $40, so I understand your concern. I think my car does cruise and accelerate smoother now, but that could just be from replacing the gaskets.

Dueling Duratecs '95 SE V6 MTX 0 Mods '04 Mazda6 S Wagon '03 Kawasaki Z1000 But thus do I counsel you, my friends: distrust all in whom the impulse to punish is powerful! Friedrich Nietzsche