newbie

hi all im new to this site and landrover for that matter bought myself a landy mk11 w reg 4.0 v8 petrol lpg converted been really happy until last week so here is my first post probably out of many for some help and advice ........ runs mint on gas but switch it over to petrol no power changed maf and plugs where do i start with one of these basically on petrol a bit lumpy with no power yet pn gas runs sweet any suggestions greatly appreciated

Hello and welcome