Glitching

[crazycol]

Hi guys,I'm after some help..I'm having issues with my car glitching,mainly my steering but a tiny bit of throttle also,iv tried a new tranny and rx and it still does it so I'm presuming it's either my esc or servo that's gone down the pan but not sure which.i dnt have another to try and dnt wanna get a new one and it turns out it's the other,if you get my drift.
Any advice would be welcomed as I'm tearing my hair out here,and I aint got much to start with,lol.
Cheers