Gas cutting between 3 thousand and 4 thousand

First of all, I have been following the peugeot fan page for about 3 years, but for the first time, I am writing 2002 model 206 xt 1.6 16v when I have a car while working, it is as if there is something going on as if there was something to cut, gas cutting between 3000 and 4000 cycles and shaking a little after 4000 cycles.

Clean the throttle, have the calibration done, and I think change the place where you gas first.

What is the estimated expense, a friend of mine said to the brain

First of all, do what I say and go to the setting does not exceed 50 liras. If you are constantly buying gas, replace it. If the problem is the brain, the veterans understand, but a little salary
Costly brain.

He does it at gasoline, but I traveled at gasoline for 3 days, the same continues

Then show it to someone who understands what we say from afar. Even before you show some people

First, clean the throttle, then connect it to the computer and have it calibrated, so use it for 2-3 days on gas without taking the gas again.

Thank you I will go today