TBI Flooding

Hope someone can give me an idea where to start troubleshooting my TBI problem. Engine floods when trying to start. I can remove both electrical connections to both injectors and it will start and run until the fuel in the tbi is gone. I can then just connect the electrical connection back up to one injectior ( either one ) and the engine will crank and run.
While running i can connect the other connector to the second injector and the engine smooths out and run and drives fine. Any ideas appreciated.

Thanks
Phil

sounds like a problem with your ECM, to verify this, use a noid-light instead of one fuel injector, if you start the engine with the noid-light connected, it should begin flaring. If it's countinously ON, the injector driver in the ECM is damaged (then you would need a new ECM -> ebay is a good source for cheap spares). make this test with both injectors.

Also it could be a bad injector, the simplest way to find this out would be to try two other injectors.

BTW: do you get any trouble codes?