I have a 1991 trans am gta
It has 5.7 tpi engine
I am getting horrible gas milage and I am getting gas into the brake booster hose( I don't know how this is possible)
Needed help ASAP
Have replaced fuel injectors recently and tps
Distributed and has new tune up

Check the vac line from the fuel reg to the intake for fuel
If the diaphragm in the reg is broken then fuel will be sucked straight into the intake

No gas in vacuum line to regulator but car as been sitting all day , but will drive an recheck tomorrow

no need to drive, pull the line and switch key on to pressurize the fuel system, check if fuel comes out

It is leaking , will change it tomorrow , thanks
Do you know how I can tell it iac is working ? I had it out and turn key on and it didn't move but I don't know if that correct way of checking

Don't do that, it could shoot the pintle out of the unit! not sure its a good idea to just shove them back together.