blgrass

93 f150 5.0. 4x4 when in park it idles between 500&900 rpms when in drive and I stop idle drops to where it cuts off

raski

Check idle air control unit. The pintle and its bore in the throttle body might be carboned up.

techrep

iTrader: (1)

This ^^^

Steve83

The caption of this diagram explains how the IAC works, how to clean it properly, and there's a link to a TSB about checking it:


(phone app link)

But there are a hundred other things that might cause the same symptom. Without knowing more about your truck, its history, & its current condition, we're just guessing. Read this caption, and fill in your signature here:


(phone app link)