Hi please can some one give me advice my spectrum dx3.0 glitches on the throttle servo witch is also a spectrum . any help on this please

Need more details on your equipment setup, and under what conditions you experience the issue. A weak battery and loose connections are a couple things to check for.

But in general, perhaps try a 'glitch buster' or 'stutter stopper'. A capacitor on the receiver to stabilize the Voltage during surges:

http://spektrumrc.com/Products/Defau...ProdID=SPM1600

thanks noticed it when the car was idling also my pitman said he could hear something was not right on the race track as in revs drop to idle and back up again