I am new to this forum, I'm a follower of the geo metro forum mostly, but have recently purchased an 04 swift plus which has the exact layout of a chevy aveo. My question is, under the intake manifold there is a sensor that has a red wire and a white wire in the plug for it, it also has what looks to me as either a fuel line or a vacuum line attached to it, what exactly is the sensor and what purpose does it serve?