Miss fire

[renton]

As title right I've got a audi a3 1.8t on a 2000 plate with a stage 1 map
it had a miss for a little time now but only under load I've tried two maf's set of plugs and coil packs but is still there
my Q is can it be an injector at fault
thanks for looking any help please
karl

 

[andy68]

Check your coilpack loom for splits and cracks, usually suffering heat damage at this sort of age, fixed a couple on mine to sort out misfires.