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    Troubleshooting poor performance and P0420

    I have a 2002 Accord SE Coupe. It's got the F23A4 motor with 165k miles and I'm having some problems with performance. At low RPMs, there is low but adequate power. It doesn't jump off the line but it's (barely) drivable. Once I get past 2500 RPM or so, the power seems to taper off and up...
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