I have a 99 F250 with the 5.4 w/Automatic...
Sometimes, when I start it when the engine is cold, it'll fire up, idle just for a second or two and then want to die. If I stay on the gas as soon as it starts, I can keep it running. All of a sudden, as I'm keeping it running, it seems like something kicks in and the idles way up like it should when running normal. I can then let off the gas and it will idle fine. I usually have to keep on the gas until it reaches normal operating temp and sometimes a bit longer. No engine lights come on or anything, it just does that. It wont' do it all the time, just sometimes.
It "seems" that when its really humid outside, like right after a rain, or in this miserable heat and humidity right now, it does it more often. Almost never when its dry outside, it "seems" anyway. It's done this since it was new, and I've had it to the dealership about this trouble, but they have no idea, since its warmed up when I get there and even if it sat overnight, there's no guarantee it would do it the next morning either.
Any ideas guys and gals?
TIA,
Doug