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This really sounds like a MAF problem. Unplug your maf and see if the problem improves low throttle. You cant rev over 2400 or so, but it will use the O2 when you are driving to get to 14.7.
Unbolt the fuel rail and look at the injectors, make sure the injectors are centered and the end caps are not broken or blocking the nozzle.
Look for leaks in the intake piping.
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