I have a 1999 Buick Regal with a 3800 series engine with supercharger. Engine will start but shutdowns immediatly.

Do you notice that the security light is on when this happens? Should be on the dash somewhere. It sounds to me like your anti theft is kicking in and shutting off your injectors. If it starts and dies in 1-5 seconds, plus you see a security light lit up, id say its 100% the antitheft. Check out this link, it has alot of useful info and quality DO IT YOURSELF solutions for security anti theft problems http://vatspasslockpasskeysecurityhelp.yolasite.com/

Sounds like the PASSLOCK SECURITY SYSTEM is shutting the injectors off.Is the security light blinking off and on?

Hi it could be ir maf sensor mine did the same thing to find out just pull off the plug that goes into it