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you can test the idle valve easily enough, it is a simple push pull device
there are 2 +9v and 1 gnd terminals, 1 +pulls one way the other pulls opposite. Use a 9v battery to test.
The main issue w/ these(besides vacuum leaks) is winding wear around the idle position, you can remove the epoxy from the 3 screws holding the core and rotate the core wrt to the body to have a new idle area. Then adapt the throttle by starting w/o touching the gas pedal. Let it idle for ~ 10min to do the adaption.
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