did you adjust the IAC when you installed it? was the battery disconnected when you installed it?
** If installing a new idle air control valve it'll need adjusted.
- Measure the distance of the valve plunger that is extended.
**Measurement should be made from the edge of the valves mounting flange, to the end of the cone.
- The distance should not exceed 1-1/8 in. (28mm),
or damage to the valve may occur when installed.
-If the measuring distance is greater than specified above,
use your finger pressure to slowly retract the pintle,
by using a slight side to side motion to help it retract it easier (valve with collar at electric terminal end),
or compress the retaining spring from the valve while turning the valve "in" with a clockwise motion.
- Return the spring to its original position with the straight part of the spring end aligned with the flat surface of the valve (valve without collar at electric terminal end).