I have a 94 2500 5.9 4x4 I replaced the fuel pump twice and the crank sensor also. Now when I hit the brake pedal the truck will stall out. The truck runs great till I hit the brake the harder I hit the faster it stalls, even in park. Thanks for your help

 

Disconnect, and plug.... the vacuum line to the brake booster. See if it still does it. (test in your driveway, it will take some real effort to make the brakes stop the truck.)

 

Ok disconnect it from the booster side and plugged it and it still stalled.

 

Probably an electrical issue then....... Hows the battery/charging system?

 

The battery is newer and it's showing around 14 volts.

 

What's it do when you step on the brake? If you hold a little on the gas, will it stay running?

 

nope it still stalls the motor. I had it up to 3500 rpm and held the brake pedal down and it stalled.the truck idles and revs up ok till I hit the and hold the brake.

 

Now I'm thinking the torque converter maybe locking up. Does this sound like right?

 

Wouldn't matter in park. Does the engine just STOP, or is it akin to turning off the ignition? Any loud noises associated with it?

 

First thanks for your help. No noises and it just stops. If I let off the brake the motor will run.