Won't stay running

I have some questions. Have you checked fuel pump pressure? Has the check engine light come on? Have you checked the idle air control and MAF sensor? Have you checked to make sure the catalytic converter is plugged? If you keep your foot on the gas, will the engine continue running? After it dies, will it restart and do the same thing or does it refuse to start? If it doesn't restart, have you checked to make sure you are still getting spark and fuel to the engine? Any major vacuum leaks?

Sorry for all the questions. I'm just trying to get a feel for what has been done and what exactly is happening.

Joe

Just to satisfy an old man's curosity, unplug the cannister purge solenoid to see if it helps. It is located under the battery area.
We have run into a few of those when we had the early to mid 80's Crown Vics.

Try what way2old mentioned to see if that changes anything. The fact that it won't restart after it shuts tells me either the fuel pressure is low or weak spark. Let me know what you find when you unplug the purge solenoid. Also, when it doesn't restart, make sure the fuel pressure is within spec and you have a good hot blue spark.

It could be somethhing that simple. Have you tried using drygas?

The sensor was shorting internally and grounding the 5 volt reference to the PCM.

Here is a picture of it.