If it's been sitting for so long, did he clean the IAB? My '88 did that for years, and especially when I disconnected the battery for something. After I drove around for about 40 miles it would stop until I disconnected the battery for something again. As soon as I switched to Mass Air, the car never did it again. Good luck!
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Joe!
1988 GT, 167,000 miles!!! 13.58@105mph Check out my listing!
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99 Ninja ZX-6R:10.32@135mph!
1993 Olds Eighty Eight LSS 16.40@88.8mph