Ok i know nothing about cars but here's my problem PLEASE HELP. My car was doing fine for a long time smooth idle smooth ride but seemed to what i thought had a little bit of a power problem. Now when i switch from D to N it speeds up the halfway past the 20 on the tach. Also when i drive in now it stutters a little bit and i have no power. Could this be a fuel injector problem? What things could i do to make it run smooth again and have my power back.