I have a 2004 Dakota with 80K on it. It is a 4x4 with the 4.7. I just noticed that it is idleing rough. I dont notice it when its in gear but it is very noticiable when the truck is in park, doesn't matter if the A/C is on or not. It also doesn't matter if its just started up or if its been running for awhile. Anyone have a fix for me. I have heard IAC and to clean the throttle body but I haven't seen any for sure fixes from other forums. Thanks

 

By idling rough, do you mean that it isn't staying steady and it is constantly revving a bit and then unrevving a bit and not going steady? Or is it literally just sounding all garbled and not running smoothly?

Or does it seem like it is maybe in need of a tune up? Start with basics: if you haven't done the spark plugs in a while, it wouldn't hurt to go ahead and do them. Since you have the 4.7 you will just need to change the plugs. You don't have a rotor or regular wires. You have a coil directly above each plug. Take the nut off that holds the coil in place and it pulls right up. New air filter. A dirty and/or clogged filter would affect the quality of your idle, but usually it would cause it to stall if it was really bad. If your idle is screwy still or even as a prelude to all of this, take your time and try to examine as many of the little air hoses as you can around your engine bay. These are your vacuum lines and they can affect your idle by being clogged or broken or leaking. If there is a leak, you can usually find it by running the motor and looking through the engine bay and listening for an odd hissing or whistling.

 

Check your rubber vacuum hoses if any are cracked or split they could be letting in air. I had a really bad miss under engine load and it turned out to be the rubber hose that went into the charcoal canister had a big split in it. Once replace the miss and backfire went away.