Chevrolet Spark 1.0 year 2009

I have enjoyed varied comments on mechanical issues, since I am not a professional mechanical rather amateur.
And today I had to make a consultation. Make the change of spark plugs, high and caliber cables. But after that the car has come to attract; When I need to accelerate, it gives me a problem and how it drown. I thought it was the gasoline pump but they told me that the gas filter that is under the cabin in the back of left? But when I accessed her she has a cable and I don't know what she is.
Being in those step a taxi driver with a car of these and I wonder what happened and told the behavior of the car and said that is the butterfly, change and now.
What is the butterfly and where does it go?
I appreciate your comments will always be good to learn.
From Colombia thanks.

You want some cable to be in the equibrated cylinder Czech well the order or Ork. Filter There is no problem of anything. If not the same friend take it to Scane and leaves doubts there is the. Possible fault will give you a gia and as far as Mariposa SA can refer to the acceleration body or the TPS sensor