loose throttle
Here is where the throttle cable to the throttle body is adjusted:
Here is what it looks like with the clip removed:
I found the clips on mine were barely hanging on and were not depressed to hold the cable into position. When I would step on the gas, nothing would happen for the first inch or so of pedal travel. The result being throttle response at low rpms sucked. I had my kid step on the gas while the car was off and I watched what happened.... greater than an inch of play in this section of cable alone. When you take off the clip you'll see why.
Additionally, because of the play, when WOT my throttle blade only opened 3/4 of the way and did not come close to even hitting the bumpstop.
After I adjusted the cable to where I wanted it (to take up excess slack), I pushed the clip back on and throttle response was restored.
I don't know if this is the same problem you are having but its something to look at.


