Cold start idle issue

[sambomonkee]

Got the same problem on my ZR 160

I narrowed it down in the end to either

1. Dodgey fuel pump
2. leaking injectors.....
but before that....

Have you replaced your fuel filter? cheap and easy, might be restricted.
Camsensor is another cheap and easy change, that might help.
Look for vacuum leaks, the fuel trim data with point to a problem if there is one, i such as loose pipes, best check the lpg injectors as well, as they may be allowing in un metered air.

Do the cheap and easy stuff first.

Also stick a ODB on it, so too look at the fuel trim data when it is running, may give indications of under or over fueling that you are not aware of.