Hello, this is my first attempt using this site. I have been going through the extensive idle guide on this site. I'll cut to it. 1990 gt 5spd. Cold start the rpms go up and drop to 500 then stall. I have to rev it while it stumbles to keep it running. Once warm (in a few minutes) I have no trouble. I have no koeo codes now. Koer codes now are 21,33,41,91. I have tps adjusted, timing set, new plugs/wires/ect/iac/thermostat/egr/egr sensor. Egr sensor I had to shorten the rod to get proper volts and get rid of a koeo code. Also did clutch and other unrelated things. So the cold start is my problem. Koer codes to help. I also cleaned the 10 pin connectors. They were good but the prongs for the "VREF" and "o2sensor heater ground" looked a little darkened. One last note, when I tried to start with iac and spout unplugged it wouldn't, but I unplugged the MAF and it fired right up. I have since re-set the idle after removing the iac spacer plate to see if it helped but the lack of plate made more adjustment needed. This has been a 4 month pain in the butt for me and I'd greatly appreciate help. Thanks!