My truck dies when I hit the brakes when slowing down but runs great up to that point I've done changed the booster fuel pressure sensor and fuel pump nothing has worked. Any ideas?

Check your . Throttle position sensor and idle sensor. Hopefully you will be fine after that. My guest would be the idle sensor.

do a tune up on the engine check your air filter and check ur vacuum lines first. does it feel like stalling out a manual transmission? at the worst the tcc solenoid is stuck open

Remove the brake light switch relay , the see if it stop shutting off.is so check bcm

AZGOLD I have aftermarket nulti point fuel injection on my 91 gmc 350 about 42 psi to the injectors fuel pressure gage in the cab, pressure does not drop on engine stall. still dies coming to a stop or when coasting down hill (throttle closed). this happens when the engine is warmed up only but never happens on a cold engine. gotta be an air something problem.

Truck starts with a jump. Touch the break pedal and it dies.

Did you ever fix the problem?

Mine goes dead after I stop it’s loosing electric power connection