engine problem

The gas pedal doesn't respond and when it does only works fruition 2-4k rpms. It also bounces the rpms by itself. Whatch video here: https://youtu.be/PVJtcRypLw4 what can this be? Thanks.

Hey guys, I've got a 2003 Protege5, automatic with the nifty shift gate and "manual mode." Recently, I've been having problems where the engine fires up and after a while the whole car starts shaking. The engine vibrates A LOT. It's not noticable at higher speeds/RPMs, but definitely freaky...

I am hoping to get some guidance on a problem that I am having with my 2007 CX-9. The problem occurs when I am cruising just below 60 mph and around 1500 rpm in 6th gear. When I apply the gas lightly to accelerate, the vehicle seems to "stutter" right around that 60 mph mark, the car seems to...