I have replaced all sensors on my engine maf, iac, tps, and map sensor and my engine won't idle after it warms up, is there something that I am doing wrong. When it warms up it runs at 2200 rpms.



lt1 40over, aluminum heads with 208 valves, 58mm throttle body, slp pistons,1.5 roller rocker arms

 

Did you set the pintle length before you installed the IAC?

Shoebox has an IAC reset procedure:

http://shbox.com/1/4th_gen_tech2.html#iac_reset

And a check procedure:

http://shbox.com/1/iac2.jpg