2006 df 250 won't start

[camar304]

My df 250 won't start unless to push the throttle itself n will die when not to push the throttle.but when the engine start..the idle is bad.already check all the fuel line n ignition...all is ok.anybody please help...tks

[JUST-IN-TIME]

sounds like the iac valve

any alarms?

[camar304]

no alarm, no check engine signal..