today i started to break in my nitro engine on the 3 tank it started to shut off then my father moved the high speed needle and then we figured out the glow igniter battery was low so we replaced it and now when im driving whenever i apply 2/4 throttle or more the engine cutts out plz help

Might be running rich still.

so how much should i lean it out

3rd tank is a little early to start leaning out, but you can if you want. When you adjust you needle settings picture the face of a clock around the screw and turn 1 hour at a time untill you get desired result. Try not to touch low speed needle until you have completed break-in, and have you HSN set pretty well.

Also keep checking your glow plug, it can go bad and you try everything else but that.

so if the glow plug is bad it will start then cutt off when stress is put on ?

Usually it will not start up or after you take the glow ignitor off it dies. I think you are still rich. I would do what was posted about about the clock and hours and maybe lean it out about 1 or 2 hours at the most at this time while breaking in.

o so ill test the plug and get back to u

ok i tested the plug its good but ill try the hour thing tomorrow because i hear its not good to tune cold engine. and i have one more question when i car shut of the third time i used the fuel bottle and sucked all of the gas out of the tank can i put it back in the main fuel bottle

That is sort of a loaded question. Some say no way and some do. I do it and never had a problem. I am not waisting my fuel LOL!

good point me either i have no money to waste

one more question how do i know when the engine is fulley broken in ?