Car is hunting need help! for Professional mechanics?

okay so it all started when i was testing and disconnected spark plug caple from the coil while the car was running and at that moment it reved up to 4000 rpm and stayed there until you would tap the gas pedal then it went down and started hunting!, and this happens now every time when the car is turned on it revs on 4000 or something until you tap the pedal. and also if you disconnect the vacuum hose from the map sensor it stopps hunting but idle stays at like 1500rpm, and as soon as you connect the hose to the sensor again it starts hunting again(It is not the map sensor! i have tried changing it with no change!) it cant be that the car is taking false air cause it started when the wire was disconnected from the coil. so i was thinging maby somethinghappenedd to thestepper motorr when the wire wasdisconnectedd from the coil and damaged the stepper motor is that apossibilityy? what do you think