interference or electrical
 

So at certain distances, approx 60 feet, and not always, the car will start to slow and look as though it is "convulsiing"
as if i was hit throttle, stopping, and repeating very quickly?
doesnt seem to do that close at all?

RE: interference or electrical
 

which rc is it, electric or nitro?  Could be interference.  Does it happen at one place or everywhere?  Make sure you antenna i extended as high as possible on the car in the tube unless your using a 2.4 system, same goes for the antenna on the radio.

RE: interference or electrical
 

ITs an electric..actually an HSP but I  have put himoto parts in the car and figured they are fairly similiar.
It happens at the same distance, and its when I am turing the car around to drive it back
thanks

RE: interference or electrical
 

Sounds like interference, try it in a totally different place and see if it happens there too.