When driving in town and generally when coming up to an intersection (so we're going fairly slow) you hit the brakes and the pedal goes hard and seems to pulse and the car dies. It will restart but when put back in drive it dies until it sits a few minutes then starts back up and runs fine until you hit the stretch of bumpy road. I thought it was ABS brakes acting up but doesn't appear to have ABS
If the brake pedal goes hard right BEFORE the car dies, and not after, then you could have a problem INSIDE the brake power booster. try to verify this next time it dies at a stop, if you can safely pull the dead car off the road into a driveway (or try to make it stall in a bumpy parking lot) - then before you try to restart the car, open the hood, pull off the rubber hose where it's plugged into the brake power booster --> you SHOULD hear a big "Swoosh" of air being sucked into the booster because there's supposed to be a strong vacuum there even after the car stops running. if you get nothing there, your car is dying of an excessive vacuum leak through the brake booster.= bad booster.
SOURCE: 95 buick lesabre dies like its getting no gas
get a tune up ie...change plugs and wires...fuel filter, air filter, and check to see if you have a VATS system in your car
SOURCE: my car 1949 buick lesabre is pulseaging while diving it.
I had the same problem with a 1995 Buick Regal, my case I changed the Mapi sensor and the hesitation completely disappeared. The hesitation up hill wasn't there any more. Its easy to do, I was told to clean my sensor but I had a spare one of another Motor. Unplug the map sensor remove the three flat head screws and switch it with the new one. I worked for me and I have been driving for the past three months and have had no trouble.
Hope this helps.
SOURCE: I replaced the master cylinder in my 1993 Buick
You have a 16 year old car and I would bet the brake fluid has never been changed. First thing to do is replace all the brake fluid in the system and bleed the brakes. Start at the RR then LR >> RF and end at the LF. The contaminated brake fluid may be causing the calibers to stick. You may end up having to replace the calibers. It is also possible you have a brake hose that is collapsing. If so the brake hoses will need to be replaced. It can also be the brake booster causing this but that is rare. Possible but rare.
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