sticking throttle

[biggsteve97]

I have a custom built 87 chevy 4x4 silverado with a 350 v8 and the last year Ive noticed the throttle likes to stick when you lift your foot of the pedal and only while the engine is running. Like when shifting gears or after being stopped at a light/sign. The throttle cable has broken three times because of this now. I replaced the throttle cable bracket to give the cable a better approach to the throttle body thinking that was it. Even swapped throttle bodies out with an extra one and the pedal still sticks. Ive checked the throttle shaft for play and while there is slight movement it is in no way loose on either throttle body. I replaced the throttle cable this last time with a lokar stainless steel and braided housing unit. When the engine is not running the throttle seems fine and when I first started the engine the throttle is fine but only for about 15-20 seconds of running. I am at a loss. If it wasnt for the fact it seems to only stick when the engine is running i would think the throttle pedal pivot is worn out. Anyone have any thoughts?
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