Hi my phantom 3 std has a problem moving to the left, it judders , I can move backwards and to the right ok forward it judders a bit and  move slowly but not full movement
can any one help.

Did you calibrate the RC yet?

yes, took blades off and run the motors, smooth contol forward, back, and right, but the motors judder when move the stick left

If your description is accurate, this is an odd problem.  

I have to wonder if the flight controller (MC) is bad.  

Otherwise, the only thing I can think is that your controller's right stick input is bad (intermittent) when you move it to the left but that would be very unusual.  I've never heard of it happening, but I guess it's possible.  

I would do a careful calibration of the RC as suggested in the post above by Peterx.  See your manual.  If you have a bad controller, you should see the intermittent issue during the calibration while the AC is steady.  

If you see nothing, I think I'd do a complete recalibration of the IMU, RC, and compass.  Then do a careful test flight.  

MHO

Let us know how it goes.  

Good luck

Thanks PeterX and Mark I have done the IMU and Compass recalibration so will try RC, thanks Glenn  

All done, re connected rc and calibrated, before pressing start I moved the right stick, moving it to the left it indicated 0 and all other movenents indicated 100%, pressed start and calibrated and all seems to be ok now. Test flight tomorrow, thank you all for the help

Give us updated how is the movement in to the left and happy flying.

Test flight today all ok now, full control and camera controls now smoother, thanks to all