Ford 4L V6 fast idle

For free info that's pretty accurate, autozone.com is good.

Can I ask a couple questions? Do you have a Check Engine Light illuminated? Can you hear a vacuum leak anywhere? Does it happen all the time?

There was an oddity about my 1992 Ranger 4.0 that not many people would know about. Every once in a while if it didn't start right up, the compression would make the engine kick back a little. Two times when it did this it blew a vacuum plug off the vacuum tree on the intake. It was very strange, and if I were like most people, I'd have never known what was going on. I actually heard it pop off both times with my then-young ears, and both times I found the vacuum plug lying under the truck.

Just a thot.

CJB