Usually it's fuel or vacuum related, fuel pump has been done so lets go to Vacuum, Some Fords when the IAC is a bit sticky, can cause extended cranking, or even a clogged PCV, or cracked PCV hose, if it's more when cod, the engine coolant temp sensor, and or Intake air temp sensor, these can be checked by a scan tool that can read the degrees, check these two sensors in the AM before the first start, they should be within 10 degrees of each other. Ford did have a tech bulletin on the Idle air control, not sure if your year was included.
See probable causes:
1. A dead fuel pump (could be the pump, pump relay or wiring circuit);
2. A plugged fuel filter;
3. Low fuel pressure (weak pump or restricted line); or
4. No pulse signal to injectors (bad injector relay or PCM driver circuit).
One of the first things to check is the fuel pump. Does the pump run when the engine is cranking? The pump should make a little noise. No noise would tell you the pump is not spinning.
On most vehicles the pump is energized by the PCM via a relay. The pump circuit also may be wired though an oil pressure switch and/or an inertia safety switch that kills the pump in case of an accident. Refer to the wiring diagram to find out what is involved before jumping to any conclusions.
Other electrical problems that can affect the pump include low voltage in the pump's power supply circuit or high resistance in the pump's ground connection. Either may prevent the pump from running or spinning fast enough to generate normal fuel pressure.
Vacuum leak/coil/ignition control module/distributor pick-up coil
Thursday, April 24th, 2008 AT 5:25 PM