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stop at your local autozone and ask them to read your code... Let us know what the code is.... Or you could have Onstar run a diagnostic and have them tell you what the code is..
Does the car seem to be running ok? It is possibly to put it together so the MAF sensor ends up backwards.. HOWEVER in that case the car hardly runs... or might not even start...
Not completely familiar with the K&N filter.. is there a metal bar the runs the length of the filter?
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