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Try cleaning mass air flow sensor if there's not a gasket or other vacuum leak. When engine is cold it plays a greater role (sole role in some cars) in determining air/fuel ratio. When engine is warmed it enters closed loop and AF ratio goes off O2 sensors. A dirty MAF sensor will not accurately...

Last guy I bought it from said he put a new transmission in it. I am tempted to just toss the part because all it does right now is rattle.

Yes, passenger side.

I think this is a heat shield or something for wires going to the transmission. Does anyone know what it is called? This is on a 1996 2DR Tahoe.