2004 Grand Prix Stalling

My wife has a 2004 Grand Prix GT2 with the 3800 series III normally aspirated engine (approx. 23K miles). With increasing frequency, it has begun stalling immediately after being started (usually when motor has not been warmed up).

Also, and more troubling, it has twice completely stalled while my wife was driving the car (car was warmed up both times).

We have been to two dealers-----neither found any fault codes. The service advisor hooked up a data capture device to the car and drove it home, and he was able to reproduce the problem----they then diagnosed the fuel pump and replaced it---sounded like a reasonable diagnosis and cure to me.

However, we just tried to start the car and it did it AGAIN! Has anyone run into this problem or have any ideas what might be causing this?

Thanks in advance
JT

On 13 Aug 2005 19:37:08 -0400, JT
wrote:

>My wife has a 2004 Grand Prix GT2 with the 3800 series III normally
>aspirated engine (approx. 23K miles). With increasing frequency, it
>has begun stalling immediately after being started (usually when motor
>has not been warmed up).
>
>Also, and more troubling, it has twice completely stalled while my
>wife was driving the car (car was warmed up both times).
>
>We have been to two dealers-----neither found any fault codes. The
>service advisor hooked up a data capture device to the car and drove
>it home, and he was able to reproduce the problem----they then
>diagnosed the fuel pump and replaced it---sounded like a reasonable
>diagnosis and cure to me.
>
>However, we just tried to start the car and it did it AGAIN! Has
>anyone run into this problem or have any ideas what might be causing
>this?
>
>Thanks in advance
>JT

Has the battery been tested? If the battery is weak or failing, it
may cause this as the computers these days need to see a consistant,
good voltage in order to keep the vehicle running. Possibly the
alternator also...