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Check the Idle Air Control (IAC) and the EGR valve. Either one or both might need cleaning.

It can. But it could also be a number of other things. My car recently had this problem, but it turned out to be a firing problem and not the converter. so i'd say have all the cheeper stuff checked first.

Check all vacuum hoses. You should be able to hear the hiss.

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βˆ™ 2015-07-14 16:09:50
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Q: Can a bad catalytic converter cause a '97 F150 to hesitate and shake as if it is going to stall while idling?
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