1999 alero stalling

Have recently baught allero 1999 V6 model 3.4. Engine stalls suddenly while running. This happens at random. Have been told that the computer is giving problem. Did any one have similar problem. Do I have to reprograme the the computer. if I replace with a new onr. Any suggestions appreciated.

First I'd replace the plugs & wires, change the PCV, fuel filter and clean the Idle air control valve (http://www.automotiveforums.com/vbulletin/showthread.php?t=663849).

If those have been done and did resolve your issues then I;d start checking the ICM and coil pacs.
And check the fuel pressure from the valve on the pass side rear fuel rail.
With the key on, engine off, fuel prssure should be around 41-47 psi.

Good luck and Welcome to AF!