Engine will not start up and run?

I ran the diagnostics but no codes come up.

Thanks for your suggestions but I seem to think that my problem lies with the ECU. My question now is if I replace the ECU what steps will I need to take to make sure that the key is going to work since it is a PATS key?

If I get a used one from the salvage yard what steps need to be taken to make sure the key is going to work? Is there an instruction video or tutorial on doing this? I want to be sure how to correctly do this so I dont screw it up. Thank you very much.

Ok replaced the fuel pump. Engine turning over fine. Just want start. Pretty sure the fuel pressure is fine.I think I need a noid light to see if my injectors are pulsing. And if the noid light isnt blinking, what else might be the problem?

My truck overheated on the freeway and when I pulled over I checked the coolant and coolant reservoir and they were both empty. I bought coolant and put it in and 10mins after it had all poured out because there was a crack in the radiator. I fixed the radiator and put more coolant in and now it will turn over but won't start up.

Electrical problem
1998 Ford Explorer 6 cyl Two Wheel Drive Automatic 103k miles

I have a 98 Explorer Sport with a 4.0 SOHC / automatic trans. The car has a bit over 103k miles, and has always ran great. Recently the car won't restart after driving. If I wait a few hours the car will start with no problem. It does idle really slow, about 4-6 hundred rpms. I have recently replaced the crankshaft position sensor, ignition coil, fuel filter, and the starter, but the problem still occurs. I have also checked all the fuses in the dash, and under the hood, and they are all good. Any suggestions?

The check engine light used to come on periodically before I changed out the sensor, now it never comes on. The spark plugs are also receiving power.

I'm pretty sure I heard the fuel system prime whenever I turned the key. I do not know how to check the fuel pressure.

I know it's getting gas, because I changed out the fuel filter, and it ran fine after that.

Okay, I'll check the pressure next time it happens. I have no way of knowing when the car will fail again, since it's an unpredictable problem.

If there is pressure in the lines generated by the pump, what else could I troubleshoot?

Thanks again.

I am haveing trouble getting the truck started. I have replaced the fuel cut off switch and it still will not start. I did replace the fuel pump a few months ago.(Used one) I have used a test light to test the plug that the cut off switch plugs into and the light is very dim. I am lost from here.

Thanks
NateLang

The switch that im talking about is the fuel inertia switch. The pump is not kicking on at all.