Idling too low and causing vibrations through the car
Ok so I have been driven crazy with the rough vibrations that I get when I come to a stop at stop lights. I have noticed that the rough vibrations that I can feel through the steering wheel and seat only happen when the car starts to idle around 600rpms. Is this normal for my car to idle at 600 b/c it feels like the car is about to fall apart like it has 300,000 miles on it? Would it be possible to raise the idling to 750rpms which would alleviate all of the vibrations? Thanks for your help.