Engine will turn over, but will not start

Have you tried to hold the gas pedal to the floor ? Ford's have clear flood mode strategy programmed into the PCM , if you hold pedal to the floor the engine computer disables the fuel injectors . If it is flooded holding to the floor will clear it out .

When you say it wont turn over that implies that you can not hear the starter turning the engine over. If you can hear the starter cranking the engine over but the engine will not start try holding the gas pedal to the floor. Be prepared for the engine to start and let off the gas. If the engine stalls when you let off the gas try starting again but feather the gas pedal after it starts. It it stays running with the pedal depressed than I would agree that there is an issue with the IAC and it may need to be replaced.

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Not quite everything is fine.
Is the check engine light on ?
When you push on the gas pedal, does the engine speed change ?
Can you rev up the engine in park ?
What have you checked so far ?

I had the same problem and it was the throttle position sensor. have you replaced this? Very easy and solved everything.

Absolutely.

If you took out the filter and it's dirty you can't see light thru it replace it. As far as not starting unless the air filter is now a solid block of dirt it should start, if the engine is fuel injected you must not touch the gas pedal while starting the engine or you will flood it.If it's flooded assuming you replaced the filter. Push the gas pedal to the floor hold it there while starting, after the engine starts remove your foot from the pedal to avoid engine overreving. This should fix the problem. Air filters should be changed every 12 months if you drive in dusty condtitions sooner the better

It's flooded like you say.
If it's really flooded, you'll have to remove plugs and dry them off.
Install them.
Now when you crank engine, hold gas pedal to floor.
That will stop gas from spraying into engine.
You need to get the gas out of the engine for it to start.
Crank for 20-30 seconds with pedal to floor. Do this 3 times waiting 2-3 minutes inbetween cranks.
The starter needs to cool down.
Then after that start normally and see if it will start.
Remember if it will not start after 2 attempts, then the possiblity of it flooding is there and you'll have to clear out the gas by holding the pedal to the floor again.

holding the gas pedal to the floor while cranking shuts off fuel flow to clear a flooded engine. Check for injectors staying open too long. Is check engine light on? If yes, get codes from free scan at Autozone.

Try this. With the key on and the engine not running push the gas peddle to the floor and release it three times then hold it to the floor until the oil light flashes. This should reset the oil indicator light. It should not take more than about 20 or 30 seconds.Good luck.

1. hold gas pedal to floor while trying to start. do not pump pedal.
2. holding pedal to floor is how you start a flooded f.i. engine