idling madness

hello.

my k11 has gained a idle problem with in the space of a few hours.

it is permanently hunting for revs when not under load. between 1k and 2k is were it is hunting.

its a 2000 k11. 1l

I've had this before and it turned out it was the throttle position sensor missing the screws out of it but this one isn't missing them.
by hand the butterfly in the throttle body is stiff so I know that wont help.

any advice before i rive the throttle body of and rip it apart to see if its the dry joint?
 
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