My dad offered to pressure wash with some 'gunk' my engine, it was pretty
much in places so off he went and did it.
Ever since the clean though the car is running lumpy, it feels almost like
it's lost half it's power - it's been for a couple of long runs since (over
100 miles) and this was a couple of days ago. Even today it's still running
badly - it doesn't stall or anything, it just half as smooth and 'nippy' as
it normally is.
Any ideas what on earth has been ruined by the engine clean?