Starts But Then Dies!

[Broosedamoose]

So the truck (2007 4.0 SOHC 4WD) was running fine yesterday but this morning I went to go out and it starts but then the RPM's drop and it dies. I have plenty of fuel pressure at the rail. Every time I start it it does the same thing. Could it be a bad TPS?

 

[NIGERIAN RANGER]

1. Bad TPS
2. Crank sensor might be bad too
Have you retrieved any codes yet?

 

[Dirtman]

How soon after start does it die? Common cause of that issue is the ECT sensor as it gets stuck cold and it will be in "choke mode" and as the engine warms up it floods and dies. This takes 30 seconds to a few minutes depending on outside temp.

 

[Broosedamoose]

It starts and the RPM's immediately drop and she dies. Surprisingly there are no codes! If I give it some throttle it will stay running but as soon as I let it return to idle it just dies>

 

[Dirtman]

With engine cold, remove the IAC valve with it still plugged in. Have a friend turn the key to run, IAC valve should open. If not it's stuck. Try cleaning it, if not replace.

 

[Broosedamoose]

Turned out to be the TPS. I went to Advanced Auto and picked up a new TPS and IAC valve. I replaced the TPS fist and it solved the problem.