Why does my car rumble?

[EckOMaN2k]

My car shakes when ever i come to a stop like sitting at a stop light ( and not moving), it idles at 400 an shakes bad which is not good, but when my car is parked but idling it idles at like 900 rpms an is just fine. Why is it doing this? Also my car shakes when my car is in reverse?

[Anand]

check your timing, get a tune up.. change your spark plugs...

[[Zero-S]]

Yar...it be tune up time. And adjust your idle...it should be at or around 750.

Too low of an idle will make it shake like a beotch.

[gabossie]

to low of an idle and motor mounts. Get the tune up first, then check mounts.

[supra brit]

Mine does this too, but it is the timing and it is misfiring...I need plug wires.

[navysnail]

check your MAF for a good signal too and make sure the ground doesnt have more then .02v of difference between the MAF ground and the negative terminal of the battery

[supra brit]

Well mine idles rough for a few seconds, then smoothes out, then will go rough again...still misfiring/timing?

[w1ngzer0]

mine vibrates in the back. But thats it. Oh and my clutch barks when you do it just right :P

[Nathan]

Because, your car is like a bottle of tums...

[Dattebayo]

your clutch barks at you?

You need to pull that dog out of your belhausing and start treating him right.lol

mine makes some cool mid-pitched metallic rubbing/whining nioses sometimes out of 1st gear! I love it!

[MinisterofDOOM]

Heh...my Ranger's clutch barks, too. You know its not good when your Nissan has things in common with a low-end ford. Get it to a shop, fast!