Source Rage of Elements pg. 15
Actions with the infusion trait tweak your kineticist impulses. You must use an infusion action directly before the impulse action you want to alter. If you use any action (including free actions and reactions) other than an impulse action directly after, you waste the benefits of the infusion action. Any additional effects added by an infusion action are part of the impulse's effect, not of the infusion action itself.