Does Anyone Know What this Part is?

[mbl]

This piece fell off my 1995 Mazda Protege. The car is a standard, if that matters. It has lost considerable power with accelleration. The dealership didn't see anything missing but I forgot to bring the part with me to show them. Does anyone know what this part is/what it does or where it goes?

Thanks in advance for any help.

[bgibb68]

???? what part??? if there was s'posed to be a pic i see none

[mbl]

Bump(bump)

[XoX1de]

pretty sure is under your cross member, rear one.

[91Protege]

Isnt that the plate that pops into the splash shield to cover the hole for the crank pulley?