Sound like you could have a miss in one of your cylinders. May not throw a code either. I had this happen to me when one of my fuel injector wires came loose. Car felt super sluggish under 3k. Felt down on power.
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R/T Built motor, wiseco 9:1 Pistons, Eagle H-beam rods, ARP L-19| BP kit, PTE 6766, EPS 70mm TB, GTR Intake, PRS lower conversion| ID1000cc, CJM Twin pump 340&255, PRS Rails, CJM fuel return| Fast Intentions| R/T Tuned, 660WHP 596WTQ at 18lbs. 93 octane
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