High RPM it bucks and sounds fouled low rpm is awesome

I have a 2009 DRZ400sm and all of a sudden the engine has been crapping out at 75 miles an hour, bucking, low speeds, low rpms runs great once the rpms get higher it acts like it just stops getting fuel, when I gas it, the engine sounds like its fouled a plug but still continues to run great at low rpms all of the time. Confused

FMF power bomb

Q4 Silencer

JD Jet Kit (shop installed the kit need to get the specs)

That's all that's been done

HELP

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