Fishermans fame

Hi all I'm hoping someone can help, I have a C4 Picasso 1.8 petrol last month I had several warning lights appear , Eps system faulty, Handbrake system faulty and depollution system fault I turned the car off and and restarted and all the faults apart from the depollution system faulty vanished, I had it look at by our local garage who said it was cylinder 3 misfire and told the coil needed replacing so I had it done. All seemed fine till yesterday when it all happened again the car showed the faults as above and was running really lumpy again turned car off and restarted and only the depollution fault stayed but ran fine with a little lump on idle, today started the car and fault has gone but car still slightly lumpy on idle, I've had a search online and I'm finding nothing about the petrol engines . Please help !!