I'm curious to know, and I try searching the forum for a previous answer but didn't find any. My J41 fly's fine, and I've been very happy with it. The problem I'm having is that my toe pedals constantly shakes back and forth rapidly, and it's annoying. To help with an answer, I use FSX with EZdok and a paid version of FSUIPC. My joystick is an Extreme 3D Pro, which I'm not having any issue with any of my other payware or stock aircrafts, including the PMDG NGX. Your help will be appreciated.

Toe pedals or rudder pedals?  There are toe brakes on the rudder pedals, either there is a spurious rudder or brake signal reaching the simulator.  I assume it is rudder and your stick has a z axis. If so, try a null zone for the rudders center position to see if that changes things.

 

If you have assigned axis thru FSUIPC (something you don't need to do) then try moving the fsuipc.ini to your desktop temporarily to see it that changes things.

Don't know if this will help, but I encountered some mysterious rudder movements and it turned out that I had to disable the rudder axis (twist axis on the joystick) on my X52. Seems FSX was picking up inputs from that and my rudder pedals. I had the twist axis locked on the stick but I guess it was still sending something to FSX.

I'm with Dan and Randy on this one. My bet is that this is an issue with your controller/hardware. The potentiometers might not be as good (or are getting old), and as a result, their signal is degraded/jumpy. The sim doesn't know what is a jumpy signal versus actual control input, so you're seeing it more visibly on the pedals. Have a look at the control calibration screen and you'll likely see the same shaking.

Thanks gentlemen, I'll check tonight and see if what you mentioned above is something I need to look at. Will report back to let you know.