Core Rc Code 2.4g FHSS Throttle glitch.

[Squidzilla]

Ive noticed when setting up the steering points that my throttle was glitching open during movement on the steering stick...

I don't appear to have the trouble when trying it on my other car which means its buggy side rather than tx..

Is it more likely to be the Receiver or the ESC?

Setup as below.
ESC - Hobbyking X-Car 120A Brushless Car ESC
SERVO - SAVOX SC1257
RX - CR152 - Core RC Code 2.4G FHSS Receiver
TX - CR151 - CODE 2.4G FHSS LCD 2 Stick Tx + RX