I first thought this was to do with the Brake master cylinder leaking into the servo...This has all been fixed now with another Mater cylinder.

When starting from cold or driving and coming to a halt the engine revs drop right down as if its going to stall. I HAVE ALSO NOTICED THAT IF I PULL AWAY QUICK FROM STANDSTILL THERE IS A MASIVE HESITATION/DELAY BEFORE THE ENGINE PICKS UP AND FLY'S AS NORMAL.
I WOULD PRESUME THAT THIS IS SOMETHING DIFFERENT FROM THE BRAKE FLUID LEAK WHEN ALL THIS CAME TO LIGHT.?????

Any ideas please.???

Thanks