Why my 1996 grand am starts then 3-5 second later it shuts off?

Your 1996 Grand Am may start and then shut off after a few seconds due to several potential issues. Common causes include a failing fuel pump, clogged fuel filter, or problems with the ignition system. Additionally, it could be related to a faulty sensor, such as the crankshaft position sensor, which can prevent the engine from staying running. It's best to have the vehicle diagnosed by a mechanic to pinpoint the exact issue.