Fuel system issues

805moparkid, try this out. I just fixed this issue with my Demon this weekend, I put it on a chassis dyno, and the dyno man said it sounded like it was in the rev limitter. I have a MSD Digital 6 box. The rev limit was set at 6500, but was breaking up at 5900. Set it past 8000 and the car pulled to 6500 clean on dyno and gained 50 HP at wheels with no engine tuning at all! Check your chip! Car went from 111 MPH limit on dyno to 119 MPH!!
Chuck