Delay gas power

it takes it a sec or two for the engine to respond.

For instance if I'm in neutral and all of a sudden I give it some gas for about a second it'll be like I haven't touched it, stays the same sound and all, and then revs up.
It's like it's delayed or something.

This happens on and off with it.,Stabbing in the dark...... jetting too rich(pilot jets)?, choke sticking?, air screws out of adjustment? carbs out of balance? time warp messing with your perception?,,,