Vitara 1994 bad idle and loading up
 

Hi, Does anyone have any clues as to the prob that i am having with my suzuki. When it idle (cold or hot) it loads itself up. At present it is idleing low (500ish rpm) but sometimes it will idle high (1500rpm) and then sometimes it will bounce betwen the two. When idleing and under load it will load up the engine and start spluttering. Have checked the plugs and they are in fine condition and good couloring, plug leads appear to be in fine condition also. On oil leaks any where. Does not use any oil or any water.
Any help would be great!!! Thanks