I took my Rush evo out today and i have a few questions about the tuning, firstly the throttle servo jumps randoms on its own, secondly the throttle response is exremely poor it only does about quarter of the speed it normally would, thirdly there is a high pitch sqweak when i first start using the car and finnaly the break is ok but it takes a while for the car to stop completely. Any ideas?
Thanks in advance DH-02

dead receiver batteries.

Or Dead transmitter batts

Ok thanks, also could the mixture be wrong? (i played about with it)

what would be the best upgrades for the rush. my budget is quite small so what is the essential ones