What is happening is the 642 is a 5 volt reference low. When the explorer is reset it will run good till ev monitor does its check which im assuming is the emissions/ evaporative system. When that does its test it runs bad and wont stay running.

I got a 4.0 v6 ford explorer xlt. Recently its been running rough and unable to stay running after couple minutes. Been getting p0642, p0452, and p0191 We have already replaced plugs wires fuel pressure sensor on fuel rail egr and vent valve near rear axle. Now if I unplug the battery for 5-10...