Mejzilk 18-8 carbon fiber prop. I do not think the prop has any effect as it was flown at 8K RPM with this prop before.
When you try to accelerate it acts normal to mid throttle (5.5K RPM) and then quickly stops like it is fuel starved. If I return to 5K or less all is immediately fine. I have opened high jets to 3 plus turns and the low jets to the point where it will not run, and all points in between.