ok, I have done eveything for the NCR and I was idolized.

I think the problem occured after wearing white mask stuff for a quest, but now I am nuetral to the NCR. I have done everything pro NCR and I *SAW* that I was idolized.

is the only way to fix this to go back to old save? or use console code? this happen often? I found out about gltich on fallout wikia but no solution there.

Before you go to an extreme, try putting on some NCR armor, then remove it. If you wore faction armor while using it to repair another suit of armor it temporarily 'sticks' to your rep, putting on some more faction armor and removing it should solve the problem, if not, you'll need to reload or use a console command. I don't play on PC, so sadly I cant say the CMD

I am also neutral with Caesar, who I already met with, and afterwards killed all the legion in cottonwood cove, nelson, teatichup, booted, etc.... they should freaking hate me (vilified)

Hmmmm, then you'll need a PC user to give you the reputation reset command. Or just reload an old save, whichever you prefer.

I have not tracked it down yet in my saves, but it was a while back! (and I tend to get a crash if I load game, check it out, load again, etc....)

I went back to way earlier in game and saw for sure I was idolized. I was good BEFORE I played a mod that took me out of the game map and nuetral when I got back. the NCR was not even listed in the general reputation factions.

I did setreputation 1 80. it worked. I wish I knew what it had been before, i mean exact number. oh well