problem?????
Well when mine stuttered and bucked after my LT install, it was a burnt O2 wire. It was too close to the headers and the metal melted through the wiring. I replaced it and wrapped it in heat wrap, works fine now. So check your O2's
Is it throwing any codes?
Could be a misfire....
I say all this b/c i've encountered both of these problems and the symptoms were much like yours.
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