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5th gen BB6 1997 Base model, +150k miles: Recently had a trusted mechanic shop do a JDM swap using the p5p ECU that was working fine with the original USDM motor.

Great standing acceleration and pep, BUT going uphill it slows down and won't get over about 2500 rpm. Flooring the pedal doesn't do anything. Before I start tearing into this, ANYBODY HAVE EXPERIENCED THIS?? Ideas??

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I had an issue once where my cat had gone bad, and the stuff inside broke free and turned sideways. Hitting the gas hard actually bogged the car down due to so much back pressure.

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