I'd do both. Injector cleaner is about $10 and a new fuel filter is about $20. The fuel filter is really easy to do, just don't forget to take the fuel cap off and purge the fuel rail via the shrader valve. You can also drain pressure form the fuel system by removing the fuel pump fuse and letting the car run until it craps out.
NGK Laser Platinum plugs are around $20 a piece, but read the plug first. If it is fouled, cracked (unlikely) or the gap is off, change them. If the Gap is within a few thou and the plug is clean of a light silver, they are fine.
peace
NGK Laser Platinum plugs are around $20 a piece, but read the plug first. If it is fouled, cracked (unlikely) or the gap is off, change them. If the Gap is within a few thou and the plug is clean of a light silver, they are fine.
peace