[Redog]

I didn't think 99's had EGR? but that wouldn't cause the issue your having.

I agree with Eric and wonder if the TB is closing too much. Never heard of it on a FI car, but it could be possible. What about the fuel filter? A faulty fuel pump on these cars is never in the "going" stage. It has two different operating moods. Working or Not working.

Check to see if the coil packs are tight. Plug wires aren't loose on the plugs. No burn connections bewteen the ICM and wireing hardness