So yesterday August 12th 2015, my car started acting differently when I was driving. Every time I let go of the gas the RPM would try to drop to 0 and when I tried stepping on the gas I had to floor it in order for it the RPM to go up. Once it would get to 0 the car would shut off and won't turn back on. I had to wait acouple of minutes to turn it on and see if it starts back up which it did. Now it's in my drive way and I've cleaned the throttle body thinking it was that but it still sounds like the engine is trying to shut off and it sounds weaker every second it's on. What could be the issue?