it would have been good to have scanned the computer to have goten the trouble codes before all this work was done..there are still a few tings that can cause this,,,it would seem you may be loosing injector pulse,,,
1-the ignition module
2-the pick-up coil in the distributer,,either could cause a loss of injector pulse and still have a spark on the plugs....also
the problem here may be the map sensor,sense it seems to run longer with the ect disconnected...
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advance can check the module for a spark,,but,most of the time when you loose pulse,,it will show good anyways......when they do this ,,testing dont help