Check engine light!

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rAiN_Twist

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Hey guys,
I have a 1998 GMC Yukon and my check engine light came on AGAIN! The first time it came on, me and my dad looked at it (my dad knows a lot about these trucks). He decided upon back pressure. We took it to autozone, and nothing came up, so they cleared it. So today I was driving and it came on while I was on campus. I didn't think anything of it, probably back pressure. So I was driving to lunch, and I was following a friend that was going a "little" fast if you know what I mean. And we were trying to get back to school REALLY quickly, and the check engine light went off. Is this a bad sign?


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ISU-152

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How does the CEL come on and not throw a code
 

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