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afr and fuel pressure will be fine up to say 4000 rpm when the engine is running closed loop (the ecu wants an afr of 14.1:1 and the narrow band o2 sensors will tell it if it is getting it or not); you'll get a cel if you're not getting enough. at wot the ecu goes open loop and the o2 sensors are useless as the ecu is trying to make an afr of 12.5 or so. only way to know if you are getting enough fuel is if you run an aftermarket wideband o2 system.
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