Idle issue on an 89 sidekick 8v

[fixkick]

what is a plunger valve?
do you see a plunger valve here (sounds like a part off toilet tank? ) LOL

sorry you meant the DP, dash pot fast idle vacuum device. yes 100% retacted is always true after engine starts , after 3 to 15 seconds, (15 is ALASKA)
IN FACT THE DEVICE DP IS CALIBRATED, and on a running engine it is retracted and has gap (air gap there) so can not change idle ever , like that.