Hey all!

I have a stock Parkzone Mustang p51D BL and have been having a blast with it. For some reason today i was flying and a minute after take off my engine became choppy. I had full throttle and it sounded like "verr verr verr" Sorry hard to explain. It was full throttle then lose power than throttle back up and it kept going like that. My guess is the ESC is going bad, what do you guys think?