Ok. All a car needs to run is fuel, spark and air. Which one aren't you getting ?
When it dies take a used spark plug and put it in a pulled plug wire. Ground it. Does it spark ?
If no ... read and troubleshoot the ignition. It only has about 5 componenets.
SEVERAL post here deal with that.
Does it have gas ?
Try and relieve fuel pressure. Squirt some gas out of the rails or get a fuel presure gauge to find out. Worst case , crank it over , pull a plug and smell it . If no, troubleshoot the fuel system. A good troubleshooting technique I've seen is to inject some propane into the throttle body to see if it will try and start. Don't blow yourself up.
Even a pop, pop, pop, would suffice as if it were " trying " to crank.
Again, it only has about 5 components.
Does it have air ?
It should have, as this is usually the last thing to go wrong.
Anywho, start with the spark. It'* usually heat related .
1992 SSEI Bonneville with all the options except heated windshield and ride control.
Mods Include 1998 SC'd Delco Ignition with Belden wires.
Autolite 104 plugs ,180 degree tstat
K&N Filter with ricepipe, 2.3 inch pulley with ZZP idler
Ported exhaust headers, Poly end links.
High flow cat. TPS tweak, Boost bypass mod
High low fan override.
" Always try it yourself. I bet the guy you pay to repair it broke a few before he fixed your'*. "