Question about 97 Grand Prix?

You can purchase a remote from Ebay or the dealer (recommended), but either way the dealer will have to program the remote, and if it is another problem, they can diagnose it there.

I just might be abit cheaper if you installed an aftermarket alarm system with door lock accuator controls to open the door locks. Probly for about $100-200 depending of the brand of the alarm and for another $100 your could probly get a remote engine start too. The original key fob with probly cost about $100 each (might need 2) plus the programming another $125 or so...

Did you check the air filter, change the gas filter on a yrly basis?I'd do that plus clean the throttle body and it's linkage , plus I'd check the gas pressure valve or replace it, and check the gas pressure with a gage. Hope that helps and best of luck.By the way I'd be buying a service manual for that car bec it be quite helpful to you in the long run and look around the EGR valve for a plastic black valve device that has vac lines connected to it , that could be the cause.Keep in mind that certain parts would be very cheap to pick up at a big do it yourself auto wreckers.

I would recommend the dealer, it might cost a little bit more than a generic one, but they should be able to get a replacement one for the frequency that is already on your car.

Good Luck

Go to a Gm dealer...they should be able to look into this for you and at least be able to get replacement parts.

pontiac dealership or change battery in the thing controls or check fuse for door locks