Got a bfn ute, factory gas. Starting to have problems starting it especially when hot, I turn the key sometimes nothing, sometimes a splutter, cough or backfire! Appears to be coil prob! I have all service history & receipts the coils have been replaced 3 times under warranty,,along with plugs, tuned & serviced by non LPG mechanic! starts ok for a few months then starts to play up, when driving it goes well! So any suggestions, ideas, help would be great. Cheers