[96wWindstar180K]

searcherrr
If you have a fuel pressure tester (available from Sears about $30.00) you could test your fuel pressure. It should be about 40 lbs. You could also try unplugging your fuel pressure regulator. As long as the problem is happening at idle and your not cutting out at higher rpm it could be a combination of the ccrm, fuel pump or vacume regulator or even the fuel pump. I only think its not the IAC because you already replaced it. Check the fuel pump pressure first. Is that your original pump? Hook up the fuel pressure gauge with engine off and once connected turn the key to the on position the gauge should read about 40 lbs. If it only goes to 25 lbs try turning the key to the off position and back on again and see if the pressure goes up. If so the fuel pump is going bad. If it was at about 40 lbs start the engine and watch the gauge as the fans cycle on ad off. Is the fuel pressure dropping? Now unplug the fuel pressure regulator with the car idleing again watch as the fans cycle. Is there any change? Now acclerate the engine with the vacume hose removed from the vacume regulator and vacume hose plugged the fuel pressure should go much higher and fluctuate because the regulator is removed from the system. These processes wil just help you rule out the fuel pump and regulator. Post back your findings.