In the Holley tuning software, there are two acceleration enrichment prameter sets: Delta TPS and Delta MAP. Both contribute an additional amount of injector pulse duration (extry fuel, immediately) over the base fuel map value; the amount for each is based on a rate of change detected in the TPS and MAP values. The faster either changes..the more fuel added. You should stat with the TPS enrichment values..increase those a bit, especially the ones toward the right side of the entry table that are for faster throttle movement (a throttle 'blip' for example..which is where it sounds like yours is stumbling).
Tuning the Delta TPS is equivalent to playing around with the acellerator pump size and cam setting on a carb.
Tuning the Delta MAP tabnle is almost identical to the TPS..the faster the drop in manifold pressure, the more temporay fuel is added. This is equivalent to the operation of a power valve on a carb. You can alos increas or decrease the delay time..the amount of time in milliseconds that the additional fuel is removed from the base fuel map value after it has been added due to a sudden drop in manifold pressure (i.e. gas pedal got stomped..)
Make small but significant (i.e. 15-20%) changes in these parameters and then check it out after each change. It will come around.
Your idle problem sounds like your IAC valve is not properly balanced. This means that the throttle body stop screw is set too far open and, once the motor warms up, the IAC is maxxed out in its closed postion and cannot drop the idle any further. You can see in real time what the IAC postion is on the computer screen and verify that..and get it back to a good operating point by playing with the stop screw on the throttle boddy. I have mine set so that the IAC is about 20-25% open, on average, when the engine is warmed to normal temp, leaving 75% of the IAC capacity, or 'range', available for the cold idle control process.
