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IME, misfires are rarely caused by injector issues, but more often ignition related. I have probably seen 100 coils fail for every injector failure. If he was to go swapping anything, I would swap coils. He may have a ton of miles on his plugs and leaking plug tube O rings as well. There is not enough information to draw any conclusions.
But first I would change the oil...
Just my $.02. YMMV.
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'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
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