It is quite possible that you have a faulty mass air flow sensor (assuming it was not replaced during your recent tune up),
damaged idle control valve or perhaps even a loose or...
Not exact matches
In most cases, the issue of «self acceleration» is caused by one of the following; a
damaged throttle body, vacuum leak, electronic throttle
control, or
idle control valve issue.
However,
valve replacement is generally the ultimate repair as the
valve motor may be
damaged from repeated attempts to
control the
idle speed.
Hi there: The only things that I could think of without being there to complete a diagnostic inspection is that perhaps the
idle control valve dirty, faulty or is
damaged and needs to be replaced.