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The 1993 is not worth a great deal of money. Pulling the valve cover requires an expensive sealant to put back on, but that may be worth while. If a valve is stuck because of a bad valve guide, you would come out cheap. If it is a bent valve, which can happen when an electrode falls off a multi prong plug, then the head must come off.
Removing the head is a non-trivial matter and gets expensive. The timing belt cannot be 115K miles old without showing extreme signs of wear. I would also check for a rear main seal leak. Poor maint practices will lead to over pressured manifold gasses and cause seals to break.
A headgasket failure near #4 would create all sorts of other problems other than loosing total compression.
You won't know what is wrong until you take it apart, and the cost of putting it back together may be more than the whole car is worth. Remember, many parts of the 1993 model are unique to that year and may be hard to come by.
BTW, driving at 5000rpms is good for these engines. It causes the valves to rotate and free up.
Klaus
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1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi
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