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Discussion Starter #1
Tonight I was driving and my car does not back fire anymore, nor does it slow down as much when I downshift. What could be causing this?
 

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Maybe you all the carbon build-up was finally released!?
 

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usually that "poping/backfiring" is really all of the excess gas in the cat burning off from the flames coming out of the exhaust valves. It could be that your cat cleared itself out...
 
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