Simple diagnose need service.
Sounds like the vacuum modulator on the side of the transmission or the vacuum hose going to the unit. I'm not sure if buick Is fed off of the carburetor vacuum or there's a vacuum tree on the rear of the engine block that may feed it as well. Typically if there is a vacuum leak to the modulator, your engine power will be decreased and your engine will be running rough.
SOURCE: Trans shifts very hard after 5 minutes of stop and go traffic
A reason for hard shifting could be a problem with many things with various degrees of seriousness. It could be your ATF( automatic transmission fluid) is low or broken down and old. This would cause the hardness and the reason for stop and go traffic effecting it. Another possibility is your transmission is just shot, and the timing gears inside are worn and not properly shifting at the correct RPM causing a **** during shifting.
Some possibilties, not all!
~Lucas
SOURCE: 2004 Buick Regal. Hard tranny shifts.
Try some Lucas Transmission fix. that stuff has done wonders for almost all of my tranny problems
SOURCE: 2000 buick regal surges under slight acceleration.
Check for a engine misfire corroded plug wire ends or coil tower,cracked spark plug,bad plug wire.
SOURCE: sometimes the transmission on my 2001 LeSabre 3.8
Have someone check for any transmission codes these don't always turn on your check engine light,If no codes and your speed sensors are reading ok it sounds like you may have a accumaltor piston seal may be leaking.
SOURCE: I have a 97 buick lesabre with 3.8, at about
Replace plugs and wires at the same time to fix. It goes to lock up mode in the transmission at that speed and this is when you most notice a slight skip or miss.
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