oops had meant to quote Wheeliefast, it sounds like yours is interference, do you have the wires close to each other? no copper exposed? antenna (if it has one) out in the open?
is there a way to move the receiver further away from the esc? even just temporary to test? are the new wires wrapped...
does that radio have channel mixing? ran into that when i was learning my JR Racing XS3, when i got it, it mixed the 3rd channel with the throttle when i pressed the brakes.