Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
did you set the iac when you installed it?does the engine light come on?if so,can you give me the computer codes?
this may help
CLEANING AND INSPECTION PROCEDURE
MEASUREMENT PROCEDURE NOTE : If installing a new IAC valve, replace with an identical part. The AC valve pintle shape and diameter are designed for the specific application.Measure the distance A between tip of IAC valve pintle and mounting flange. If greater than 28 mm, use finger pressure in order to slowly retract the pintle. The force required to retract the pintle of a new valve will not cause damage to the valve.INSTALLATION PROCEDURE
maybe the computer is bad or maybe there is a vacuum hose that i cant see i dont know but if you are a local garage maybe i could just bring the truck in
sorry i was off line
of,if you spayed the egr valve area and it altered the engine ,,there is a vacuum leak,,it may be at the rear of the throttle body or the egr diaphragm may be leaking