j3 chip rev hang

hey guys.
I originally made this post on fordmods but got told to post here...
okay so with a standard ecu my car runs fine, resistor modded does not rev hang etc. When I plug this j3 chip in which I got 're tuned with no success, unplug the ac, the car rev hangs when changing gear. But yet the car idles perfectly.
Now if I unplug the ISC .. and adjust the idle screw to 800rpm the car will not rev hang at all. (Note I have changed almost all sensors on the engine and have done intake and exhaust manifold gaskets. The engine is untouched and the tune is only for 98 octane and to changeover to manual .
any ideas anyone?
I originally made this post on fordmods but got told to post here...
okay so with a standard ecu my car runs fine, resistor modded does not rev hang etc. When I plug this j3 chip in which I got 're tuned with no success, unplug the ac, the car rev hangs when changing gear. But yet the car idles perfectly.
Now if I unplug the ISC .. and adjust the idle screw to 800rpm the car will not rev hang at all. (Note I have changed almost all sensors on the engine and have done intake and exhaust manifold gaskets. The engine is untouched and the tune is only for 98 octane and to changeover to manual .
any ideas anyone?