After installing new spark plugs, wires and a new coil pack, the engine is backfiring?

Hi there. The first thing that comes to mind is crossed plug wires. I would double check to make sure the wires are connected in the right order. I have provided a diagram showing the correct firing order. Please let me know if you need any further help.

Thank you... And I followed your diagram and the back 3 wires were crossed so now the car is running good.

I'm happy to hear that! Have a great day.

And you do the same.