Rough Idle on Range Rover 4.0S

[cocalc]

I have a 1999 Range Rover 4.0S and I noticed that it is running rougher than normal. I don't really notice while driving. I did have the RPM's jump a little while at a stop light but stays at about 900 RPM while in drive (stopped). In park though, the RPM's are between 1500 and 2000. I did open the hood and make sure that all the plug wires are on good.

Let's just say it is running like it is dead winter and I am just starting it in the morning.

Any thoughts? Could bad plugs or wires do this?

[cocalc]

Bump....anyone here?

[nickm347]

If its running rough, and the plugs and wires are fine, try cleaning out the throttle body, MAF sensor, TPS sensor. These things could could a rough idle. Did your check engine light come on, or any faults at all?

[Rasheed]

you need to get fault codes read mate. could be any of the sensors nick mentions and/or knock sensors, lambda sensors, a jammed cat, poor ignition from coils......