your throttle valve in the valve body is most likely sticking
(assuming a 700-r4). go to a trans shop and have them put a sonnax
kit in it to sleeve the valve bore, or you'll end up replacing the
throttle valve in a 700R4 is steel in cast iron
if it's sticking, it is because something is shedding metal particles
sometimes you can free it by running the truck at a fast idle, in neutral,
and having somebody pull out and release the throttle cable a few times at
but it WILL stick again
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