rpm

Good day people. Please I need your assistance. I have a Pontiac 2007 G6 and lately I discover that the RPM is not working when I drive. The RPM only move when I start the car and returns to Zero (0) immediately. After this it doesn't move at all. Please does anyone know what might have caused...

alright. I'm just gonna list all the problems my g6 is having. the error codes that are tripping and the things i have already replaced. any help would be greatly appreciated as this problem has stumped a few certified techs. slow acceleration wont rev up past 2500-3500 rpm. have to left...