Oil : 10w40 is again not recommended. You will ruin your engine in the long run if you dont change it now. Read the Passo Drivers Manual. Company recommends 0w20 grade oil for 1 KR-FE engine. go for that grade or for 5w30, which ever is available.
Air Filter: Use the original toyota air filter for peak performance. Make sure its japanese. Otherwise go fr Lepon ones. they are cheaper and you may change them after a month.
Throttle Body: Get the throttle body cleaned, it ll smooth out your acceleration and overall performance.
Spark Plugs: Always use the original company fitted brand. Dont replace with another brand.
Hope this helps