In my 2004 Envoy, there's some kind of clip that looks like it's missing a bolt. If I'm standing on the left side of the enigine and look down there's a silver box bolted the engine. If you go to the left of that a little bit and look down, that's where this clip is. It looks like there should be a bolt or screw that goes into it. Just not sure what it's for and hope you guys might be able to help. Thanks.