Make sure to keep you PCV system working. Not running one can ruin your rear seal or even blow your dipstick tube.
Some after market PCV valves have two ports to replace a single port valve. They almost always include a plastic cap that you insert into the extra port if it is not needed. Personally I would get a Motorcraft valve and throw the Fram valve in the trash.
For some reason your engine is relying on the vacuum leak to stay running. I would consider pulling the idle air control valve and cleaning it. They are very prone to plugging up on late model Fords. If this is the case then IACV could be stuck shut and the engine will be searching for another source for the air required for idle. You could verify this by leaving the extra port on the PCV valve uncapped, having a helper start the engine and lightly throttle the engine. Then cap the port. Remember to keep the throttle slightly open. If the engine dies even with the throttle opened the IACV is not at fault.
Please keep us in touch and let us know what you find!
__________________
93 Thunderbird 5.0 HO
89 Firebird L03
95 F150 XL
| 
