My car was missing on CNG during the early summers. I went to the 3S and they did all sort of things including insulating the coils and plug towers. When they attached the laptop with Landi software to the kit, it showed that the injector #2 was firing a bit weak. After clearing the code, the kit worked fine. Then the problem came back and they cleared the code again.
I solved the issue by changing the battery connection which was almost broken. Now the issue is back and I am considering changing that injector IF that is the real issue. I wanted to get a feel for the price to see if it was a cheap enough fix to go ahead with.