1993 Ford Taurus 3.0 Idle Problem

Hi there, I have recently been battling a weird idle problem with my 1993 Ford Taurus. When we first start the car, it idles very high, and then almost stalls. It does this only in Park and Neutral. Sometimes it even stalls completly and we have to restart it and come across the same problem.

We have checked for vacum leaks, and gone through a whole tune up (plugs, rotor etc.), And even replaced the TPS to no avail. When we put it on the computer, I forget the codes exactly, but TPS out of range, and something about the Fuel Pump (which is fairly noisey).

Can anyone please help us.

Thanks