Sounds like the valve spring broke and the valve hit the piston causing the valve to break off part of the shoulder and hit the ingniter tip and bent it.that's what happend to me friends 2005 Prix we pulled the head and sure enough that is what happened.got a salvage head $60 bucks, had both heads serviced,valves reground ,new seats, stem guides and seals $150 bucks, piston and cylinder wall no damage, upper gasket set, coolant and oil change air filter $180 bucks and 8 hrs total labor.runs as good as new.
