Emergency Speed Problem or Transfer Problem

friends will be the same subject, but the other day, the car dropped down at 5000 revs automatically when driving with 5 gears 170 km. In other words, it does not exceed 170 km and 5000 revolutions and it seems to be singing.

I tried it in 2nd gear, 3rd gear and 4th gear today. When it reaches 4000 rpm, the car seems to be clogged and cut the gas:
What's the problem ? Please give me an idea tomorrow I will go to the industry.

Put gas in your car and try it, because it can be done on the right side of the gas pump

Man, but not in Scuba. LPGyide gasoline lamp I filled today also does not light

the problem is caused by lpg look at the lpg settings first