LOW idle and dying when baking hard


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eloyc

Forum Member

Joined
Apr 17, 2026
Messages
46
Points
101
City
Midland
State - Country
TX - USA
Vehicle Year
1994
Vehicle
Ford Ranger
Drive
2WD
Engine
3.0L
Transmission
Automatic
94 Ranger 3.0 2wd Auto. A few days ago in traffic I needed to hit the brakes hard and the truck died when I did. Since then I've had a very low quiet idle and whenever I need to brake a little hard the truck dies but starts right back up after I put in park and restart. I tried looking it up and looking into it and the 2 things I found it could be are the brake booster or the auto transmission torque converter clutch lock solenoid (TCC) I tried a few things I saw on diagnosis for the brake booster but honestly couldn't tell for sure and there is no leaks for the master cylinder. Unsure of where to go from here, could any of you more knowledgeable guys help me out. I haven't dealt with this kind of issue or a bad booster before now. Thank you all 🙇🙇🙇 sorry if my thread isn't in the right spot
 
Take the vacuum line off the booster and put a bolt in it. Then see if it idles better. You could also try hitting the brakes hard but be careful, the brake pedal will be hard to push the truck will be harder to stop.
 
Take the vacuum line off the booster and put a bolt in it. Then see if it idles better. You could also try hitting the brakes hard but be careful, the brake pedal will be hard to push the truck will be harder to stop.
I'll give it a try, every other test I did was 50/50 not a hard fail but not a obvious pass either
 

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