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What codes are you setting?
I have a K&N on my Yukon and it works fine. Some auto parts stores will read the codes for you or perhaps the service outfit will give them to you. If you post them then we can make some suggestions.
Generally reducing the resistance to flow in both the intake and exhaust is a good thing. The better the flow the more efficient the engine. I have even run my engine without an air cleaner without setting a code, not a good idea, but it works. On the other extreme, my son has come home with the K&N in the Jimmy completely blocked with mud, really not a good idea, but no codes.
You got something else going on, perhaps O2 sensors if you have over 50KMi, bugs in the Mass Air Flow who knows without the codes.
Hope to hear from you soon
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