monster troubles
 

I was driving my 8ight t yesterday when it started to get crazy. If im fuul throttle it sputters like a gas car. local hobby store said its motor not sre though. N E help please

What radio, batteries, esc settings,gearing etc Por favor :)

dx3s, maxamps 6500 30c 4s, 13/48

It's likely not battery or gearing related. My guess would be a poorly soldered connector, whether it was by CC or you. When you run it check to see if any connector (battery or motor) gets hotter than the rest.