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What else could cause a misfire if I have replace the cool pack.

(2005 Saturn Ion)
in Inwood, WV on April 20, 2012
Hooked the car up to the computer at the mechanics. Check engine light was on and exhaust had awful smell. Replaced spark plugs, boot and cool pack. Any suggestions.
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Popular Answer
on April 22, 2012
Cat usually causes bad smell. Might need to check injectors. Switch 2 injectors see if misfire moves.
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