JITTERY STAMPEDE

I Have a Stampede with a Traxxas ESC, JR Python Radio, and a Trinity 17 turn motor.
When running it, when it is about to get to it's top speed it starts tweaking, kind of jittery like.
does anyone know why this is happening. I think i might need to adjust my speen control but just wanted to be sure.
Thank's

Did you get the kind of motor with capacitors installed? The Trinity Monsters of Touring 17T double has the capacitor(s), the Speed Gems 17T single Sapphire does not. No capacitors on the motor will cause interference with the receiver. If you got the Speed Gems you will have to solder the capacitor(s)onto it.

Ya I have the touring of monsters motor
and i just add 3 of those capacitors.

Check the antenna (both on Transmitter and receiver), see if they are OK. Sounds like your ESC or Radio receiver. I had to recalibrate my Futaba ESC on my Street Sport after I installed my Speed Gems Sapphire.