there is no carb. in modern cars, unless...
2005 Toyota Tazz 130
what country are you in, cabs ended in 2006 in far from USA countries.
so that you? in S.Africa or some small Island in the Pacific running JDM cars?
quote, this you?
A facelifted version of the sixth-generation five-door hatchback was made in South Africa
as an entry-level model called the Toyota Tazz
from 1996 until July 5, 2006. The Tazz was offered as 130, and 160i. It was also sold as a panel van called the Carri. 
why not post photo of engine.
or get the FSM on this car, factory service manual, at Toyota.
it covers all THAT.
if not a carb, you cant tune it, like a carb , you fix it.
my first idea> give it a tuneup, new spark plugs, filters.