Mechanic put this rusted ecu in my car . I see that one connection has rusted away. I have 3 other ecu's to compare it to.

Anybody know what this part would do? My idle is about 300 rpm lower with this damaged ecu.

http://i36.photobucket.com/albums/e25/vancouverbc_2008/hhhhh001-1.jpg

What does the bottom side of the ECU look like?

http://i36.photobucket.com/albums/e25/vancouverbc_2008/hhhhhhhh006.jpg

the connectors are soldered into the board on the other side. i couldnt trace it to any ecu pins or anything. i guess i will repair the missing connection and see what happens. thanks