98 expedition wont stay running
 

I am having trouble with my truck/suv. It won't stay running after I take my foot off the excelerator. It stops two seconds later.
I have changed out the fuel filter, changed the oil and filter, air filter and two coil paks and plugs.

I checked for any vacuum leaks and old hoses.

It turns over but just won't stay running.

Thank you

One of the things you could check is the EGR valve. Make sure it is not stuck in the partially or full open position. It should not be open at idle.