The throttle is under the hood... it's not the pedal ...

Fire it up.. if it's running at 1500 and it's not ice cold..try to push the throttle closed ... I have seen the cable where it loops on the strut cause them to idle high if it ends up out of place.. and literally that means..it could have been just bumped or looked at funny.

Once you get idle under control...let's get back to that boost issue.