1991 Buick Park Avenue Repair Question
Mileage: 150,000 miles.
Acclertaion problem
Answer
Your description is confusing but it sounds like the transmission is slipping. Check the fluid level first, with the engine warmed up and running in park. If the level is okay, the problem could be as simple as a plugged filter, but more likely the clutch plates are worn and it's time to have the transmission rebuilt.
i had thi sissue happen before a year ago and it was a trodel sensor the transmission is fine I HOPE i had that check out in spet
this may be important. It does fine sometimes until the check engine light comes on and then ots back to the slow accelertaion from a stopped position and then pics up speed regularly after 100 feet or so
If the Check Engine came on, there should be a diagnostic fault code stored in the Engine Computer. Many auto parts stores will read them for you for free. Those codes will get you to the circuit or system that needs further diagnosis.