There really is no such thing as a “tune up” anymore, since the car’s computer “tunes” the engine as you drive. New plugs and wires, and maybe an oil and filter change, is about it. I’d like to know what this expensive mechanic is going to “tune.”
You need a new timing belt, and if the belt is included in the price quoted, the price is OK. Otherwise it’s outrageously expensive.
Ask for a detailed list of what will be done during this “tune up.”
By the way, skip the fuel injection service. It’s unnecessary and worthless. Gasoline has fuel system detergents in it, and that’s all you need.