What could cause my weber equipped 911's throttle to stick wide open when I start the engine?

What could cause my weber equipped 911's throttle to stick wide open when I start the engine? I've checked for bindings at both the pedal end and the carb end. I can't find any binding.

__________________
This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: Rebuilding your Pedal Cluster - 911 (1965-89) - 930 Turbo (1975-89)

[Nick at Pelican Parts]

You can try a stronger return spring at the carb end and also see if the cam movement is greater that 90 degrees. This will cause the cam to want to rest the other way instead of returning to where it is at idle. Also see if engine torque is overcoming the engine mounts and allowing the engine to move and pull on the throttle linkage.

- Nick