check your erg valve.
It's just above the center of the valve cover on the driver side.
its bolted to the motor
275 with the V8
Chevy 350 LT1
300 horse if it's a V8.
under the hood on the drivers side.
The fuel pump in any car is tricky, using its diagram can make the repairs easier. The diagram for a 1995 Pontiac Firebird fuel pump can be found in its maintenance manual.
where is the expansion valve located
Someone put it there.
it's inside the gas tank