Hi there, 

 

I have been in possession of my 1.2 Fabia for coming up to 2 years now and never had an issue up until a few months ago where the car started misfiring badly when idling, i have changed the plugs and coil packs but seems to not have worked, i have read a few things on forums to say maybe it’s down something that is really expensive to fix and i’m just wondering if anybody has any clue as to what it is or has an idea, only seems to come on when idling and the end gone doesn’t shut off it just misfires.

 

 

Thanks in advance 

Harry

also when brought up on a OBD reader it constantly says misfire on cylinder 3, i have replaced all coil packs and plugs but not seemed to fix it 

Ideally you'd swap the fuel injector from cylinder 3 with one of the others to see if the fault follows it, but I'd be tempted to go straight to a compression test if you have a tester.