What now??

[stampy]

id say try a receiver pack or a ubec or sumfin. my rs4 mt used to do somthing like that when i ran it with out a receiver pack. if i putched it, it woulded go at all it would just sit there and like lunge forwared alittle bit then stop then lunge forwared the stop lol, it would never get going but a receiver pack solved my problem, i could punch it from a stand still and it wouldent studder at all :P. i had a 7018 and a chily peper motor running of a super cheap 3000mah stick pack