look on the injectors and see if they have a yellow dot painted on them. There is a service gram out about an injector update, the old ones were bad about sticking because of the propylene build up from the LP Fuel. The new injectors with the yellow dot on top were made with teflon internal parts to help stop this from occurring.

Injector Assembly
( old ) 91H20-08040
( new ) 91H20-18040
Qty. 2

also found a 2nd service gram about the injector body screen found under a plate on top of the injector body on some later models and the earlier models it was underneath the fuel pressure sensor. This service gram dealt with specifically hard starting and poor performance.

Remove the injector body and remove the sensor or cover and then look inside the hole. There should be a small screen held in by a clip. Remove the clip and screen and clean it. DO NOT leave this screen out and never poke a hole in it.
On early models the pressure sensor is mounted on top of the injector holder, the screen is under there, on later models they changed the injector holder and there is an oblong looking plate with 2 screws, some were mounted on top, on the dual injector body it is located on one end, remove the plate and the filter is down inside there.

Once cleaned reinstall it and reassemble.