I have a Rover 25 1.4 petrol that has been juddering when I am maintaining a steady speed or ease off the accelerator. Also, it has just started over revving to about 2000 revs and then falls really low (almost cuts out if you don't rev it). The miles I'm getting out of a full tank also seems to be dropping and to top it off, there was a really strong smell of petrol when I parked up last time I drove it.
We took it to the garage a few months ago and they change the plugs thinking that would solve it but the problem has come back and worsened.
Can anyone offer any advice?