My advice is before making any decisions is to (once and for all) find the problem. At this point, I'd seek expert "eyes on, hands on" diagnosis, either from a well qualified indy or Porsche dealer....and actually, if it were me, I'd go the dealer route hoping that they would be most experienced. It might cost a couple of bucks, but at least you will have the knowledge to proced wisely.
The last thing I would want to see is a new forum member with a story like "I bought this car dirt cheap because the previous owner thought it had a cracked head when it was actually bla-bla, a $50 fix." Good for them I suppose, but I'm sure would make your head explode.
And to lighten your day, while typing autocorrect kept trying to replace PREVIOUS with PERVIOUS...does it know something I don't???
