Phantomboostin

Ok here it goes. i have a 88 crx with a civc SOHC vtec 1.6 obo1 mind you that. ive had this idle problem ever since we put the motor in.. i bounces from 1,500 to bout 2,500 if motor is hot or cold.. i have replaced the follown parts. IACV, MAP, TPS, CTS, and i bought a brand new dis. ai am getting codes as following. TDC position?????? confused bout that one. .. IAC.. mind that is the 3rd brand new one. ELD (electronic load detector... i dunno maybe soemone can shed some light on any of this any info is better then no info. thank you.