Check for vacuum leak
Is your brake pedal hard ? If so replace the power brake booster. It sounds like you have a major vaccume leak in the booster when you apply the brakes. Power brakes work off of engine vaccume. If the dieafram is leaking vaccume when you apply the brakes it leans the engine out. ( creates a major vaccume leak ) and engine dies. Hope this helps.
Either warped rotors or drums can cause pulsating. Apply the parking brake slowly while going about 15mph and see if t pulsates. If it does, it is the drums that need turning. If not, it is the rotors that need turning.
One possiblity could be the power brake booster is shot. When you apply the brakes it creates a large vacuum leak, enough to stall engine.
You either have a axel seal leaking gear oil or a wheel cylinder leaking brake fluid. A large amount of brake dust can cause this also. Remove brake drums and inspect.
apply your brakes gently while accelerating at the same time
Continue to apply brakes: they're not just power brakes, they also function manually.
Most common cause of that is the rotors are out of round are warped. REPLACE ROTORS.
That would be the power brake vacuum operated booster.
You did not have to apply the brake on a 91 model to shift it. There's nothing wrong.
Time for new brakes or adjustment.
by design the DAY-TIME-RUNNING lights are not intended to be turned off by choice. When you start the 99 blazer with the parking brake on, the DTR lights are off. When you release the parking brake they come on. When you park again and apply the parking brake the DTR lights will stay on, unless you stop the engine and re-start the engine. Since the DTR lights are inter-wired to the regular headlights, they can not be defeated without affecting the regular headlights.
it broke