You know it's not a fuse problem because they don't magically fix themselves and work sometimes. When it stalls, will it restart if you hold the gas pedal down 1/4"? If it does, it's just because the new computer hasn't relearned "minimum throttle".
The Engine Computer has to relearn minimum throttle before it will know when it must be in control of idle speed. It also might not give you the normal "idle flare-up" to 1500 rpm when you start the engine. To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.
If it stalls even while driving at a steady speed and won't restart until it cools down for about a half hour, the camshaft position sensor or crankshaft position sensor is failing by becoming heat-sensitive. There should be a diagnostic fault code in the Engine Computer. Reading those codes will identify the circuit or system that needs further diagnosis.
Saturday, February 23rd, 2013 AT 4:32 PM