Stop in for a cup of coffee

can you have too many grounds? I know there's one that goes from the intake to the firewall, whether it got hooked back up or not, can't confirm. But If I were to add a second ground, would that affect anything or a waste of time/money/effort?
I have two, one from the intake to wire wall and one front the head to the front frame rail under battery. Nope, a good ground is a must do, wont Bert a thing and I advise it.