1993 mercury villager, runs like its running out of gas till it is warm?

check the idle air control valve and make sure it is operating properly. when cold starting the vehicle the rpm's should be higher than normal when cold after running the engine and warming it up the idle air control valve will close and allow a smaller amount of air into the intake to idle the vehicle. you may have to replace the idle air control valve if it is not operating properly. it is located on the top of the intake manifold and has two 8 mm bolts that hold it in place.