Does my car have a problem, I got the fault code

I have my scanner I erase the code after a while I made the fault of EGR and I changed a new one no longer see the fault already is fine, but it accelerates and decelerates, accelerates and decelerate, and check well that I do not have any loose manquera, check everything I did not find the problem I cleaned the acceleration body and nothing, and I went to see in the agency of the Chevrolet explained the problem, and they told me that they told me that Reprogramming the computer, they are teaching me is first to see that they tell me that oh, to reprogram the computer because I know it is adjusted from the factory or it is true that it is reprogrammed or not, take me out of doubt it will be true or not? ..
Is Pontia Matiz 2002

That new EGR valve that you placed was in another shutter position than the one you were taking out of your vehicle, it is sure that the ECM cannot define the exact position of the shutter, so it is that the engine speed is erratic when trying to define it.
Test disconnecting the battery at least 5 minutes to delete the information information that the ECM has recorded and then connect another, in many vehicles it has happened to me that when energizing again they send to position 0 all the actuators to have a reference point with which they would initiate its operation. Not to help you this must take it to the GM workshop to place it in position with its tech2

Thank you; For getting my doubts. and collaborate your support.
I will take it to see if it resulted, and I will tell you tomorrow the result, a greeting ..

Hello; I have good news, lead the computer to reprograph it, and it is well no longer fails the acceleration, !!!
Thank you very much ..
have a good days !! ..