calvin02

My 2000 F-150 5.4L (62k miles) will not idle when cold, sometimes it's fine and sometimes it just will not idle and cuts off at first startup in the morning or after sitting for a few hours. I cleaned the throttle body with carb cleaner but it didn't help. It doesn't give me a check engine light and today after it warmed up the idle was low, about 500 rpm and not real smooth. seems like it used to idle around 700 or so. On the way home i kicked it in the ass and ran it up to about 5000 rpm, when I got home it was idling fine, but I bet it comes back in the morning.

89F150

Try cleaning the Idle Air control which is on the side of the throttle body.

351w

sounds like an idle air problem or even a throttle position sensor !

i would look at the idle air first because it isnt monitored by the EEC which would explain why no engine light comes on.
if it were a sensor it should show up in the form of an engine light.

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4x4fanatic

i drive the same truck with the same engine, wouldnt idle, cut off, ran like crap. i took it in and replaced all the spark plugs and wires runs great now. that fixed my problem, might be the same for yours