could be any number of things, im thinking fuel delivery though if you have spark..... that or air deprivation...... but there is no way it aint getting air.......
what about your spark plug wires? i've had wires that would work when i tested it, but when i drove, they vibrated back apart, i had torn the inside of the wire when i changed plugs.....
i wasnt asking if you had compression, but if you had done a comrpession test? where you check the pressure in the cylinders with a gauge and see how they compare to each otehr