where is the pcv valve located on a 94 bonneville se?

Should be on the UIM near the back side. I think.

On the left side of the UIM. Press down a bit and turn counter clockwise, then pull off the cover, be careful of the O-ring, and pull out the spring and PCV with needle nose pliers.

When putting the new one in, make sure to lube up the oring with some fresh motor oil.