I bought aftermarket valve covers that only come with one hole on each, the one side is fine b/c it fits the breather but the other side only have 1 hole but my staock valve covers have 2 holes, one for the oil and one for pcv valve.

The one side is ok, but for the other side do i just set it up and hook up the pcv valve?

Thats what a lot of people do...then just pull it (pcv) when you need to add oil during oil changes.

I just pull the breather to add oil.

ok so i put on the passenger side valve cover tonight, it is the side that is going to have the breather.

The problem now is that when i started the car to pull it in the garage and see if it leaks, when you hold the valve cover you feel vibration, almost a tapping. You dont hear it but you can feel it. Is this cause it is lighter, or did i not tighten it enough so it is shaking?

This is what i have http://store.summitracing.com/partdetail.asp?autofilter=1&part=PRO%2D141%2D750&N=700+4294839018+4294919746+400405+4294903408+115&autoview=sku