I mean at some point spending $600 to 1k on $100/hr mechanics to drive 10 miles and spend more...might make more sense to spend the money and have a new engine put in or a subaru engine conversion and just spend the money all at once instead of over 2-3 months and still have a problem. So far it costs me about $250 every 12-15 miles in shop visits to try to figure this out.