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what if the necrons tomb worlds started to awake en mass before the heresy

-would the imperium be able to stop them?

-would legions fare better than chapters fighting them?

Given how much higher the technical mastery of the AdMech was pre-heresy, it would be a much closer thing...

A fully-awakened Necron race would crush the Imperium at any point in their history. These guys fought star gods and won.

DoT Humans could maybe win if they diligently monitored the galaxy and eradicated Tomb Worlds as they were waking up. But the galaxy is very, very big - even at the height of their expansion, humans are thinly spread throughout. So it would require long-term political unity and a focus of purpose. Once you start throwing in things like Tyranid invasions, Ork Waaaghs... well, it's hard to envision of scenario where a relatively prosperous human Imperium (e.g., Great Crusade era) could keep up with the Necron awakening. Eventually they're going to have to shift their focus to another threat, and that's when the Necrons will start getting ahead of them.

Though acording to my knolage, there vunrable to phykers?

Emperor + magnus have powers on a level with gods.
Thousand sons a basic marine is powerful, more than the norm.

Coulsd be a weakness. A force lead by emperor and magnus.
The amount of mental power would be huge.

That's their vulnerability, definitely. The Necrontyr weren't able to defeat the Old Ones and their child species by themselves, they eventually had to trade their souls in and ally up with the C'Tan to beat them. But it's an open question as to whether even an "awakened" mankind with access to super-psykers could match the power of the Old Ones.

Entire Tomb Wolrds have been destroyed by the current Imperium - a full Legion Expedition led by a Primarch is a terrifying opponent for pretty much anyone, individual Tomb Worlds would be crushed - awakening Dynasties would be a different matter and would likely provoke incredably violent clashes. Also, its not just how united the Imperium of Man is but how united are the Necrons? - like the Tomb Kings they are now based on they have plenty of infighting - also how bad is the Flayer virus when they wake up.

If the awakening is after the Council of Nikea then the Legions have surrendered a powerful weapon - well except the Wolves (who don't use it with the Rune Priests - yeah right), the Thousand Sons and White Scars who carry on regardless of the decree.

You could write quite an interesting Alt universe where the Cabal is primarily the Necrons trying to avoid the rising of Chaos before they can fully awaken......

Do you mean that every single Tomb World awakens at once, or that they start awakening in a more rapid manner during M31?

The Imperium could win thanks to its superior unity and preparedness as long as Chaos didn't come around and cause the Horus Heresy during the war: I mean, The Horus Heresy Forge World books state that they even had the Eldar under control, and that would have required quite a lot of preparedness and a very short reaction delay.

I doubt Orks could have been a problem, as they are dsecribed as being completely shattered and decimated by Horus when he became Warmaster, and the Imperium had been curbstomping them for decades before that during the Crusade.

I would say very poorly. The sucess of the Great Crusade reside on a multitude of factor. Primarchs, Legions and Emperor are not a very important factor to take into account. Legions were large and well commanded, but not much more numerous than the 1000 chapters of the 41st millenium Space Marines. We could even say that the Imperial Army was probably much smaller, less experimented and organised than the Imperial Guards. The Tempestus Scions were still innexistent and the SoB a small group of Shaolin-like nuns on a distant and primitive world. The slightly more advanced AdMech would not be factor. The Necron are much much more advanced than humanity at its peak. If the Imperium was so successful during the Great Crusade its because they had no real ennemy. Necrons were in stasis, Orks weren't that numerous and divided. They were frequently purged by the Eldar Empire thus not so dangerous at the start of the Crusade. There largest population was destroyed relativly early by Horus and the Emperor. A few millenia after the Horus Heresy, an ork Waaagh! much bigger attacked the Imperium and the following ones got larger. Waaagh! Ghazkhull is the largest invasion of that sort in history. The Eldar were still completly scatered by the Fall, they had no idea how to wage war, most Aspect Temples were innexistent or had so few disciples it didn't made any difference. Commoragh was still a bright place in a crumbling infrastructure, very different than the Dark City it became. Chaos was a none threat, and the Tyranid Hive Fleet far away. Tau were primitives and so were Kroots. I would even argue that most Primarch were even poor strategists and commanders. They became famous for winning thousands of easy battles with larger, better trained, better equiped, more supported armies against foes without any advantages against them. An early Necron awakening would have stop them dead in their tracks and considering where the center of the Necron Empire was, the absence of help from the Eldar (their most dangerous foe), the various Necron Dynasties would have been in prime condition to reclaim the stars. Sorry, the Imperium had it easy in its early days, it wasn't much better.