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Thank you so much for your responses. I'm not a car guy but let me give you guys some more background. The dyno was done approximately 2 weeks after the car was tuned, and during the dyno session the shop owner told me the car was running lean in high rpm, but base on the reading he believed the injectors still have room to play with. I spoke with the tuner and he suspected the AFR reading on the dyno machine was not calibrated right and he also suggested me to get the dbox to smooth out the power curve.
I was suspecting it was fuel related too but my confusion is why it only happened in the 3-4k rpm range. If it was a fuel supply problem shouldn't it be more observable in high rpm? I'm going to do some more logging today and post it.
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