Thanks Dave for the info that I can insert the original 24-pin chip in a 28-pin socket. I did not know that was possible. I just hope I correctly modified the socket and installed it properly without damaging the ECM. Just to ensure I used a correct buffer setting, I will re-burn the chip.

wanderingturtle, I had installed a new IAC but have no way of knowing air is being pulled in. How do I check that it is functioning properly?