I believe your engine is equipped with automatic valve lash adjusters so you need not do anything about them.
If your engine had overheated previously, it could have resulted in damage to the head gasket that is causing compresison leaks and would affect cold start and idling issues.
Did you clean the throttle body?
Was IACV new or used unit?
Sunday, December 30th, 2012 AT 7:14 PM