Chevrolet: general, 1997 chevy cavalier, fuel injector cleaners

Question
My name is james, I have a 1997 chevy cavalier 2.2L 4 cyl. 5 spd.manual, Is there any certain fuel injector cleaners, fuel filters, oil treatments that i can put in my car to help it a little cleaning wise.And how long does it take to change a heater core in a 97 cavy. and is there a screen of some sort under the dash so my air blows out of the vents faster,cause it's blowing out kind of slow. I had a 89'Berreta that i had that done to and now the air blows out of the vents in that car like crazy. CAN YOU PLEASE HELP ME!!!!

Answer
The heater core would take a long time to change. Figure 4 hours with the right tools.

No specific fuel injector cleaner that I can suggest beyond changing your fuel filter every spring and not letting the the fuel level go below 1/4 tank because all the sediment is in the bottom of the tank.

The filter for the blower motor is up under the dash. Not sure where on a cavalier.