plugs and fuel system
 

i just put bottle of fuel system cleaner to clean the injector and valves and stuff.... does this actualy work? it was only $4...

and what will putting platinum spark plugs do for me if i put those in? i heard more mileage and hp....

The platinum will last longer and depending how bad your old plugs were you may pick up a mile or two of fuel economy. Fuel injector cleaner is good idea, there are many types, I use Techroline from Chevron twice a year spring and fall.

I use STP twice a year.