2001 Chevy Blazer clogged fuel injector?

i had the intake manifold gasket replaced & the spark plugs changed a couple of weeks ago. last week the check engine light came back on so i took it back & he said the radiator was leaking from the seam on the bottom. i didnt have him do anything to it & when i picked it up the engine was running really rough & the check engine light started blinking, which it had never done before. i turned right around & took it back & he said he thought i had a fuel injector clogged or going bad in #5. I have spent all the money i had on the repair he just did. is there anything i can do fairly cheap to fix this & if not then will it hurt anything to keep driving it for a few months while i save up. i have ran one bottle of injector cleaner through the gas.