losing power

for a 99 grand am gt, is there any easy cheap ways to sort of clean out and tune up the engine to keep the power there??? like fuel inject cleaner or anything... feedback please

Some things to replace to restore power lost from mileage

plugs
wires
coil packs
fuel filter
air filter
professional fuel injector / system cleaning - roughly 80 to 100 dollars; makes a world of difference
or try running a bottle of concentrated lucas injector cleaner
run a can of seafoam through a tank of gas too