what wrong with my truck

[knlath]

I have 1998 F150 4x4 with the 4.6 motor today when i started it it wouldnt idle on its own there is no check engine lite that come on. i went to parts store had them read the computer but it didnt give any error codes I any bumfuzzled before today it idled just fine.Help

[rivguy]

on the 4.6 prolly either the iac which is a problem on all fords or the egr hose breaks causing the maf reading to fall.

[bucketabolts]

It could also be the fuel pressure regulator

Dylan

[B33p3r]

probably the IAC valve. They stick closed especially in cold weather. The IAC will not fire an error code!