Vl Missfiring under load.

[Jordo2]

G'day, I drove a mates Vl today and sometimes under load it'll miss badly, then comes good after u get off it, Cant get it to do it again for a while, so very intermittant. Have replaced plugs leads and coil, checked dizzy and rotor, no cracks, checked fault codes...."system ok". Thought about injectors, but then thought they'd allways run bad if they were dirty. Checked mixtures, all good. Any ideas?
Cheers.

[harry3]

try a new fuel filter, its under the floor in front of the fuel tank

[Jordo2]

try a new fuel filter, its under the floor in front of the fuel tank

Will do cheers