Man you have to provide more information on what is happening, maybe a vid of the trouble, the model truck you having trouble with and all, these cryptic posts with zero information just does not work.....
Guya, is your issue that the servo's twitch when you run your engine? (am assuming that you are talking about your Octane).
If so, this is a common complaint on the Octane and is likely to be caused by how the CDI is positioned in the battery box. One quick way to check this is to take the CDI out of the battery box so that it is not anywhere the receiver or the servo cables and then start the truck up. If the twitching stops then you have found the issue so I would suggest looking at some of the threads in the Octane section of this forum as other members have come up with ingenious ways to shield cables and reorganise the battery box to reduce the interference.