Engine Vibration/Bucking

[Machman]

I'm looking for a bit of help figuring out why my Ranger vibrates somewhat excessively and bucks when I an in gear, just above idle, like when slowing down for a stop sign or pulling into a parking spot. Its a Ford Ranger XLT extended cab with the 6 cylinder 4.0 Liter and 5 speed automatic transmission, 2 wheel drive. The check engine light is on, and when I check the codes it says that it's running too rich.

Any help would be greatly appreciated.

 

[swifttony]

Vibration

Your idle air control valve may be in need of cleaning.

 

[RonD]

And MAF sensor, read here: http://www.therangerstation.com/tech_library/CleanMAF.shtml