Hello friends, my car has been misfire for 3 days .. especially when the car is going at low revs and when it is parked it goes by singing .. lpg is also more but when I get the gasoline it is much less. Yesterday I thought that it was caused by LPG and went to the LPG service and the master there said there was no problem. The problem could be caused by spark plugs or coils. But I changed my spark plugs 2 months ago. I wonder if the problem may be caused ... I would appreciate if the friends who have knowledge help me..I even think of selling the car because of these problems: ((((