Question about Lexus SC 400

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Looking to buy 92 sc400... seller says was all power, then extreme loss of HP. I previously owned 95 sc400 and know what it should feel like. (extremely responsive) It will barely go, yet does not smoke at all. There is a heavy fuel odor. Almost has to be a sensor etc. telling computer wrong air/gas mixture or of that nature. No engine lights are on. Hard to sifer by sound as there is a manifold leak. Any help???

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The catalytic converter might be clogged

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