So first here are the codes i have:
P1121 - Manf. Control Fuel Air Metering
P1504 Manf. Control Veh. Speed Control Aux. Inputs
P1401 Manf. Control Aux. Emission Controls
P0113 IAT Sensor 1 Circuit High Input

Symptoms:
When i start it (cold start) it rev.'s around 2000 - 2500. After it get hot i can unplug the IAT and it rev.'s normal, but the problem is ive replaced the IAT.

Ive also replaced the EGR and checked several vacuum lines.

Any help is appreciated. Thanks Chris

 

You need to use Ford code definitions instead of generic ones....

 

And what engine do you have

 

Its a 4.6 V8
and what do you mean Ford specific? More info?

 

1000 series codes can be manufacturer-specific.

 

P1121 - Throttle Position Sensor Inconsistent with Mass Air Flow Sensor

P1504 - Intake Air Control circuit malfunction

P1401 - Differential Pressure Feedback Electronic Sensor circuit High Voltage

and i pulled this from http://www.obd-codes.com/

A code P0113 may mean that one or more of the following has happened:

Internally failed IAT sensor
Faulty connection at IAT sensor
Open in IAT ground circuit or signal circuit
Short to voltage in IAT signal circuit or reference circuit
IAT harness and/or wiring routed too close to high-voltage wiring (e.g. alternator, spark plug cables, etc.)
Faulty PCM (less likely but not impossible)

 

All the codes taken as a set indicate a harness problem that affects them all.
Replacing parts is not going to fix the issue at this point.
TPS, Mass Air meter, IAT and DPFE. There all different but are related electrically in the harness.
Take good look at the wireing.
Somewhere there is damage, unplugged/loose etc and even remotely possible, the PCM.,
This is why your cold starts are not acting correctly and there are drivabilty issues..

Tell us what you find.
Good luck.

 

Indeed will take some pics once i find the problem The problem did start when it was raining :/ hope its not the PCM. Thanks for all your help!