Mis-firing after putting in garage, need advice urgently!!!

[Bromz87]

I have a Ford Focus style 1.6 petrol 2009. Today I had a mot test at a well known centre. recently I had the engine light in the car come up. I had the car through a diagnostic test and I needed my spark plugs and coil pack/ leads changed. All at this point the car was still running fine with no noticeable faults while driving. The spark plugs I changed myself. When I got the mot test I asked for the coil pack and leads to be changed to remove the fault in the car. I passed the mot test and after passing they changed the leads and coil. When I received my car back as soon as I started the engine the car was jerky and blantly mis-firing with the engine light now flashing.

The guy said it started to mis-fire after the mot test when they moved it from the car park into the garage to change the engine part roughly 10m and it just so happens it was a problem waiting to happen. I've left my car at the garage and they are going to look at it again in the morning. Am I liable for this or not as from my point of view the car was running smooth before I took it in I've asked them to change a part and now I've got a big and costly headache on my hands with what feels like a serious problem