I loose power when exclerating up a hill or onto a freeway. on 2004 Hyundai Sonata

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When I climb a hill, I am huffing and puffing. When I merge onto a freeway, I cannot excler fast enough.
(4) Answers
(1) Comments
With the work done already, I agree the most likely cause is the catalytic converter needing replacement. Exhaust is not flowing out properly causing the loss of power and the engine to choke itself under higher performance conditions.
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