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A catalytic converter that has had a melt down and is restricting the exhaust from passing through will cause the engine to lose power on acceleration and on top end. If the cat is damaged bad enough the engine won't run much over an idle and may set a misfire code. You can test for that condition by installing a vacuum gauge to a direct intake manifold vacuum source. The vacuum will decrease as engine speed increases if the cat is plugged.Give us the year, make, model and engine info for more help.

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7y ago
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7y ago

Backwards, Missfire and bucking will cause a faulty converter

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Q: Can a misfire or bucking accur with faulty catalytic converter?
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