my 550, has a 6.0 4.88 gears, sct livewire, custom tow tune and 4 inch turbo back. i noticed sometimes when i put it under a hard pull when the converter locks up and boost goes over 25-28 sometimes it will pulse , it has done it twice. both times hard enough it was like i was pumping the pedal. if i let off and let it dump boost pressure and then get back into it , it will quit. any ideas what that is? and the boost psi is not fluctuating , it just stays at 28.89 on the livewire. never goes any higher. and engine temp was 198 the first time and 206 the second time if it means anything.