I have a 2002 pontiac grandprix 3.8. It keeps shutting down. After it sit for a few minutes it starts up and run fine for about 1/2 mile and then cut off again. code reader shows p0171, p0131, p0300
Take it to a shop and have the codes read - autozone does it for free, for instance. You could be having problems with the intake air control valve or MAF (mass air filter) both are cheap to fix and can be done at home by a DIYer.