Did the owner report that it was working OK prior to being parked? The symptoms you give are that of a bad camshaft or a timing gear out by one tooth. If all else fails you might want to check those items out. I just dealt with an engine that had both of those problems combined......either one is nearly fatal, yet this vehicle drove 70 miles out to me for repair. Add to that the timing was set at 50BTDC, and the vacuum advance was buggered.
Certainly work through the easy stuff, (the coil that Lynn mentions comes to mind) but if that doesn't work for you, you may have to pull the heads and get out the dial gauge.
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