I have an au wagon series dedicated LPG. It's developed a miss fire. I have changed plugs swapped leads over and replaced the coil pack but nothing had changed. it started a couple of days ago I turned a corner and went through a puddle that came up over the LHS quarter panel. The car then stalled and eventually started again but was back firing. It has broken the air intake when it was backfiring and has been miss firing ever since.

Hi, possibly got water in a plug somewhere. will either need to air blow it out or use a water repellent spray.