kind of almost sounds like lift pump might be going out...mine started cutting out aorund 2000rpms when my lift pump went out (before i had a fuel pressure gauge).
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98 24V Injectors, 4in Straight Pipe, K&N Intake, Silencer Ring Removed, Pusher Pump, Georend Triple Disk Convertor and few other odds and ends in tranny All topped with a Loose Nut behind the wheel