1999 Volvo S80

Engine Performance problem
1999 Volvo S80 6 cyl Front Wheel Drive Automatic 160000 miles

have a s80 t6 has 2 turbos, I think, I am getting fuel and fire to all cylinders, it is only running on 3 cylinders 1 2 3, 4 5 6 are not combusting, I guess, when I pull the coils from 4 5 6 there is no diffrece in the way it runs, I have changed the plugs, and switched the coil packs around, what could be the cause of this
November 9, 2009.

Do you have a check engine light on now? If so whatare the codes? If you can post them on here I may be able to point you in the right direction?

Nov 9, 2009.