Ok, im going to try and explain this as best as I can.

I have a 1.6 G, club. Usual under the bonnet mods (veccy-pipe, derestrict, k&n)
For a while ive realized theres this slight tick/ing just before/first moment I put my foot down the accelerator. Regardless of rev. Usuall on gear 2+.
So let me try and explain again,
just as I put my foot down on the accelerator there seems to be this tick and then the gas hits in. During the tick the car feels dead/powerless.
Any ideas what it is?
(spark plugs? Egr valve?)