On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
Re: More 2.0 TS Probs
Get the garage to check the coolant for exhaust gases, as it may be the head gasket has failed. Also get the water pump changed whilst the engine is apart as this may be the cause.
Other common causes are the cooling fan not coming on, stuck closed stat or a failed radiator.
It may just be something simple though like water or oil in the spark plug wells causing the missfire, and the coolant rising may be something else, like an airlock.