Alright so i think i have a high idle, im not sure though, but it has all the symptoms of it, here they are: When switching to reverse car is forced back very hard, same in drive, slows down when i let go of the accelerator when going fast, and of course the RPM gauge says somewhere around 700-800 which is high....So how do i lower the idle, should i take it to a shop?

Thank You for your responses....