Here's an example of perception without action:
The door slammed shut behind her. The rain cooled her burning face.
See how passive that is. The character is experiencing (door slamming shut, rain cooling, face burning). But she's not acting. Imagine inserting an action in there that shows her interacting in some way with this surrounding. Like:
The door slammed shut behind her. She turned and opened it and slammed it herself, just to show him. Then she straightened her shoulders and strode down the steps, the rain cooling her burning face.
I often over-narrate, setting up the rain thing earlier in the passage, because I figure you notice right away that it's raining. But maybe she's so mad she doesn't notice right away (in which case-- I told you, I over-narrate-- I'd probably have something like, "Only then did she notice the rain cooling her burning face"). Not saying anyone else should do that. Just that I do.
Now you might say there are some perceptions that don't require an action. For example, you might say that feeling heat or cold just happens, that you don't have to move in order to experience. Or seeing a flash of light or hearing a sudden shout. But:
1) Some perception requires or benefits from an preceding action to anchor the perception in the surroundings or the character's movement through the scene.
2) Action is more volitional than perception, and so can often better express what this person wants or is willing to do.
3) Keeping the character moving will mean a more active narrative, and will also make for a more active character. This isn't just someone who "feels," but someone who does.
4) An action before the perception can help focus the reader's attention on the character. Even perceptions like a flash of light could be emphasized as startling or unexpected or expected or dangerous by showing the character's action. (Go with the logic here-- the action might have to come after the perception sometimes. What comes first logically?)
5) An action first can be a physical transition between one place or stance and another. That way the narration is flowing, not jumping.
6) An action can also set up a surprise or change, force this to be more than a perception but also something that forces more action.
It was rain, wasn't it? She stopped on the first step and raised her hand to her face, and it came away sticky. She stared at her fingers, red in the pale glow of the porchlight.