i killed the great kahns in the mission assitning the ncr in boulder city. now im tryin to continue main quest but the great kahns arent there cuz i killed them any way to get round this or do i have to restart game?

You can pass a speech check (mid 60s?) w/ the Kahn named Jessup, who is inside the building next door to where the hostages are held.

You also have to discuss things w/ the NCR solider who gave you the after you talk w/ jessup.

i killed all the great kahns in the mission fer ncr, i was doin side missions, now i went back to main quest and it says intercept g.k. in boulder city but i cant i killed them, is there any way around this or do i have to restart?

Doing the quest in Boulder City doesn't matter. For the MQ you want to visit the Khans in Red Rock Canyon. They were vilified to me, but I was still able to complete the mission peaceably.

Wait, you killed all the Great Khans in Red Rock Canyon, too? I have no idea, then.

sorry I misunderstood. No you don't have to restart. As long as you make it to vegas, you're still on track, maybe w/ a few less options, but it shouldn't be a problem.

so i just wait till i get to red rock and it will bypass intercept the great kahns in boulder?

Something seems strange because whether you killed the khans in boulder or not, it should still give you a quest complete after you talk to the NCR trooper who gave you the quest.

The khans will be at redrock, no matter what. I know that skipping boulder or quest failing in boulder will not affect being able to complete the main quest.

ima try it thanks guys

Killing them in Boulder is intercepting them. You were supposed to loot a note off Jessup.

Aghh my eyes! They are be burning! Anyways, yes you can do what the people say but I found it easier (and I didn't have a backsave) to just take a Great Kahn suit, wear it, and go to Red Rock Canyon and doing the Oh My Papa quest.

yeah you can actually sneak inside their base, free the prisoners, sneak back to the ncr, and have them attack and you don't lose any honor with the great khans, although you should have a companion with you cause when you go in the building with jessup, if you let your companion kill them, it doesn't affect you.

Companion kills do effect your rep....Well they do for me.

I bribed the NCR to let them go. I don't remember who I spoke to about it though, but there was definitely no killing.