I have a 2007 6.0 psd with a 6 speed tranny. It has the sct with DJ's tunes on it. The economy and street tunes are fine but the lunny tune keeps giving me problems. The truck starts to buck when the rpms get to around 2800. If i get off the gas and then back on it stops until the next gear. Just trying to figure out what this could be if anybody has an idea of what this could be please let me know and what if any remadies there are for this.