How much should the repair of the following cost ? on 2002 Mitsubishi Galant

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replace timing belt
rebuild valves and complete valve job
ac/heater belt replacement
fuel injection clean up
(1) Answer
You can look up timing belt and the drive belts on RepairPal:

A complete valve job is a big one--lots of variation there and depends on the extent of the work, but this will cost more than $1,000, most likely.

Fuel injection clean up--have no idea. This could be as simple as a bottle of Chevron Techron Concentrate Plus in the tank or a more major cleaning--upwards of 150 dollars.