I have a Slash and my son has a HPI Blitz here is the problem. He burned up his esc yesterday and I was going to put my extra XL5 in it. He is using a Traxxas controller and receiver already. When I hooked everything up it didn't work right. The steering works fine but the throttle does nothing. I thought it might be the motor but I hooked up a brand new T12 and still nothing. Any ideas?