3s Mamba pro question

[lil3j]

I tried running a 3s 5000, speedpassion 3.5 motor with my mmp today and I was havin problems. When I pulled the trigger it would start stop start stop then haul the mail.. This setup is in a drag car.. The only thing I can figure is the amp draw was to much with the 3.5 3s. What do you guys think? I had the esc on smart sense, 4 deg timing med start,( i tried high and low). Without compound on the tires it would jerk once and take off. But with it nothing but stop and go..