Hi guys

Hi guys I have just recently bought my first range rover a 1996 p38 4.0 v8 with lpg conversion. I bought it with a couple of problems one of which was it was a bit hard to start when cold, I managed to fix this by replacing the air flow meter and it now starts first time and drives fine when cold, but it won't start in petrol when it is warm but starts ok on gas, any ideas on what i need to do to fix this.
Thanks
Mark