I bought my wife an 82 Z28 with the 305 Crossfire injection. It has been a great running car until today. The fuel pump went out, so I tripped down to the local parts store and got a new one. I installed the pump and did not touch anything else. When I started the car it idles at 2000. Every attempt to reduce the idle does nothing. Cannot find any vacuum leaks.

Any ideas here?

 

Sounds like your IAC motor has lost its home position. There is a proceedure to reset or "re-home" the IAC. I forget what it is. Sorry. Key on and off three times, Something along those lines.