Did you get your ECU repaired by AVPRO?? I had the same problem with mine (ISC blowing some parts in the ECU) and sent it to them. I forget the name of the person I talked to, but he also recommended that I simply unplug the ISC. After looking at the price for a new one, I went ahead and tried it. I had to adjust the pintle of the ISC a few times until the truck idled at 800ish RPM. That was approximately 6K miles ago. The ECU adjusts the idle up or down as necessary. Turning on the AC with the truck idling in gear does drop RPM slightly, but it is not a problem at all. I am getting around 15 MPG, which may be a little low??? I have had no ill effects from this at all (hot weather or very cold here). So if you want to, give it a shot. My truck is a 1990, but I do not think there are huge differences in the ISC/ECU among years. Good Luck <img src="/forums/images/graemlins/wink.gif" alt="" />