hi i just bought a used RUSH couple days ago.. it was a rolling chassi and i placed a engine and servos on it, i just completed it and when i went outside to test it the car i had 2 problems 1st one is that when i turn it on and pull out da ignitor it stops. but once lik evry 10 trys i get the car to work afther i pull the ignitor out, but for some reason it moves backwords...... i need HELP []