Well thanks all for all the input! The needle and seat are the largest available for an AFB. I had bought all good fittings that don't neck down. I'll be checking the flow and for trash in the lines and vent, and everything else everyone said. RPM when it falls off is about 4000. 1st and 2nd shifts are around 6500 and its still pulling strong.... good point on the plugs. I'm pulling them after I get back to the pits. I'll look over everything today and get back on here with my findings. Hopefully the weather holds out for tomorrow. 60% chance of rain,,,, but better than