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I would buy a multimeter and start diagnosing wires before I go and buy new sensors. First thing is to always check the fuse if there is one. It is hard to tell if a sensor is bad just from looking at it. You need to measure resistant and voltage if there is any to really tell if the sensor is bad.

As for your air intake tube, it could be causing a vacuum leak which could lead to the car running bad. I would stay away from your "mechanic". I think you can probably do a better job than he can.
 
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