What is this? Part

[Keifer]

ok guys first off my car is very rough and jurky when i let off throttle when just cruising, so i ordered a used IAC, and a new tps. both didnt fix it. this is what we unplugged next and it helped with the way it ran not ruffness what is this. (img 2327)

Also it has different back brakes what are they. i think they are off mazda 6... idk not sure. (img 2331)

 

[hornsfan10609]

Those look like the stock brakes, the sensor is the purge solenoid but it shouldn't have an effect on the way it runs there has to be another issue. Any check engine lights?
Sounds like a stuck EGR, dirty MAF, boost/vac leak, etc.

 

[Keifer]

yes, but we have been messing with it so much lately they are normal. have to reset it and find out what they are. whats egr look like. MAF is brand new.