95 Chevy Silverado 350 engine 4x4 failed the no'x on emmisions. What could be the...

loveabull2006

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...reason? I took my truck for emmisions and it was .04 over on the no'x. Just wondering if anyone might know what I need to do to fix it and make it pass. I really don't want to take it in to a mechanic and spend more money than I need to. I just had to get the muffler replaced which set me back $125. I'm trying to stay cheap. It has been a while since it was tuned up. Could it be something as simple as a quick tune-up? Thanks in advance.
 
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