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Misfiring after replaceing starter

Replaced started and engine started running rough. I noticed a device attached to exsauhst . in the general erea of the starter. What is it and could the mechanic have dissrupted it, and would this cause the symptoms ...running rough occasional backfiring...97 f-150 4.6 engine automatic.
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Check clamps where heater hoses go to firewall there was an issue with coolant leaking onto ignition components causing misfiring

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