wankelforever

My 91 rx-7 keeps flooding. I can drive it for 20-25 miles, park it. Next time, it starts right up. Drive it for a bit. Park it and the next time I try to start it, major flooding. I have to pull the plugs and all that. So, MY assumption is that the injectors are bad. A local rotary repair shop says that for 120,00. it will do a 3 part cleaning of the fuel tank, the injectors and rails and the manifold. Anyone know if this is a good way to go or is this a waste of 120,00 I should be spending on something else possibly wrong. Any help is appreciated.