The OCV was already replaced, and clean oil was changed 3 times along with engine cleaner - all the time some sludge was in there.
My mechanic got the car back from Hyundai after their diagnostic.
The cost for replacing the cam gear is looking to be $250 for the part, and about 10 hours of labor - totaling $1300 or so at his shop.
I'll ask him if the fourgreen gear would also work. Thanks for the link!
By the way, do you think this is a 2-3 hour job?
EDIT: Its the exhaust cam gear