weird idle rpm

[MY VZ]

at almost every traffic light when im idling my car always sits at a different rpm ranging from 400rpm - 1000rpm this happens on a daily basis.

Could anyone tell me what might be the cause of this

Thanks

[RiCeY]

Vacuum leak, check all the lines on the engine for leaks/splits, especially the one coming out the drivers side of the throttle body with the 90 degree bend.

[MY VZ]

Ahh that hose was cracked so i put some rtv sillicone on it but obviously i didnt seal it very well by the sounds of it

[THUNDERVZ]

$75 for a new one mine went a couple of weeks ago ,cant buy just the 90 bend................

[RiCeY]

Try wrapping electrical tape along it, overlapping as you go.