hi.when i stop, and the car is ticking over,it starts to shudder as if running on 3 cylinders and the engine managment light comes on.i restart the car to clear it.a coil pack, timing chain kit,new plugs and its still doing it.please help.its costing me a fortune

derek horsburgh, July 2012

hi.the diagnosis said a problem with cylinder 1 so nechanic replaced coil pack.still had problem so he replaced timing chain (which was only done 14,000 miles ago) but he sait it was slack so put the new chain kit on 2 weeks ago.still had problem.he then replaced plugs ,flushed engine and put oil in.the car was ok till a few days ago then it started to run on 3 cylinders again when i was at traffic lights.if i take key out and restart engine it clears until a random time.it didnt do it yesterday!!!

derek horsburgh, July 2012

I don`t know what the history of your repair is or who done it but the first thing I would have done is get it onto a code reader if your management light is on instead of guessing what it can be,hence your big repair bill.

cdc, July 2012