setup problem tronxy p802m prusa i3 with cura

Hello to all guys, I'm here because I need help with cura software 2.4

The printer I have is a tronxy Prusa i3 p802m I've always used with repetier host and I never had any problems.

Lately I downloaded cura because I was reading that is higher and easier to use.

Start by saying that I had to force the update of the printer software for it to be recognized by cura and so I modified the 0.92 version I found on another site.

I set the printer profile as explained in the various guides by setting the size of the bed and of the extruder. In the section of gcode I left reprap (marlin) etc. Everything ok except when I go to start printing where I immediately noticed that the extruder makes a move without sense and sometimes print, then go over and back again to print etc etc. I think it is a problem of gcode but i tried all settings (reprap, repetier, makerbot etc.) but nothing change. Maybe someone can help me?

Try checking the start Gcode that Cura automatically adds
go to preferences, printers, machine settings,

Here is a sample of my start gcode
;Basic settings: Layer height: {layer_height} Walls: {wall_thickness} Fill: {fill_density}
;Print time: {print_time}
;Filament used: {filament_amount}m {filament_weight}g
;Filament cost: {filament_cost}
;M190 S{print_bed_temperature} ;Uncomment to add your own bed temperature line
;M109 S{print_temperature} ;Uncomment to add your own temperature line
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G92 E0 ;zero the extruded length
G1 F{travel_speed}
;Put printing message on LCD screen
M117 Printing...

What does yours look like?