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Well, GTP's aren't true dual exhaust so that kind of kills that part of the diagnosis.
1.) Have you worked on the electrical system recently?
2.) Have you done the fuel pump hotwire/fuel pump resistor bypass?
3.) What components are in your ignition system? No aftermarket coil packs I hope.
Anyway, for starters I'd check your fuel injector harness around cylinder 5. See if the electrical connection is torn, loose, or damaged.
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