spark

Hi from Rome, Italy where I converted my 1999 Jeep Wrangler 4.0L in a LPG powered to pass emission restrictions here and run everyday as a daily driver in city centre. I decided to make this post cause I can't really figured out the problem after many attemps. Symptoms are some little random...

My jeep starts fine when it's cold, but if I shut it off then immediately try to start it it will hit but not fire. It will also sputter if I drive it on the highway for more than 10 minutes like it's running out of gas. I put a new fuel pump in and it didn't change anything. Any help is much...