I have a 99 pontiac gtp that starts and runs 2 seconds before stalling out and dying.

It isn't throwing any codes. The headlights also blink after starting the car.

Need some ideas that do not involve blindly spending 100's of dollars

Sounds electrical. Of course it could be a number of things, but I'd start by having the battery and then the charging system checked. If you can't pinpoint the problem find someone who can before spending any money on it. That will save you the most money in the long run. Good luck.