The pressurized injector cleaner that attaches at the fuel rail works best. You unplug your fuel pump (pull fuse) and hook up the pressurized can to the fuel pressure gauge fitting and run the car off of it. You can get it professionally done and I have also seen the kits at Hi-Lo'/oreilley and other auto stores. Worth a shot at $35 before spending $300 on a new set of injectors. On the relatively cheap domestic injectors I would not waste my money trying to clean beyond the $35 kits. if that does not work buy new injectors. I'd try cleaning the throttle body and idle air control valve as well. Doesn't sound like an injector issue.