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Discussion Starter #1 (Edited)
I have a 04 3.5 Colorado and cut the muffler off (like all teenagers do lol) and noticed now whenever I’m coming to a stop the engine seems to bog down to the point where the lights start to dim a little. My guess would be because of reduced back pressure but I’m not sure. Any advise on what causes it and/or how to fix it would be greatly appreciated, thanks!
 

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You can try putting the muffler back on temporarily and see if the problem goes away . If that helps the problem you can assume that no muffler was the cause .
 
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