406 engine failure

Hello guys, I just joined you.
406 vehicles with 2000 model d9 engine that I bought for the week
sometimes it is as if you press the gas normally, it is like 1-2 seconds
as if it were toppling over again.
it may come because I am not used to it.
I have a lpg system. This issue ignites me
It sounds like it could be from the coil.
engine fault lamp flashes like flasher
2 problems when I connect the car to the computer
they appear
1- P1519 Cooling fan
2- P0170 Fuel trim failure (Bank 1)
Thanks in advance for your comments and assistance.
I would.