I have a Skoda Octavia 2005 engine AEE The Ajuga of the revolutions jump, the butterfly valve was changed, they told me that the engine time in the distributor moved, someone could tell me if this can be the cause and if I can regulate it again.
That problem must be checked well but you have to notice that there are no fake air inputs that the IAC is well tarado and finally if nothing works a reprogram of your control unit.