Wife was driving the Insignia home from work and it started to judder with a total lack of power. She pulled over, called recovery who read the code and said some of the cylinders were misfiring. From what I've read, it'll probably need a new coil pack and plugs. I'm no good with cars so I'll need to take it to a garage but my question is would it be safe to drive there? Or am I at risk of causing more damage? Garage is around 3/4 mile away