random KR

Hi I need a little help because this random KR is driving me nuts, not sure if it's true or false. I have tuned it on 98 pump fuel and also done a tune on E85 and still the same random KR. It only seems to be on throttle transitions like from a dead stop to wot, but then I can get it at cruise some times and even throttle lift off, it will happen when I do a on brake burn out to. Info on what I am running, procharged ls1 11 psi, fast intake and 92mm throttle body, 1"7/8 headers twin 3" system, 78lb injectors with return style fuel system. Any help please :banghead::banghead::banghead: