One problem related to transmission solenoid has been reported for the 1999 Buick Lesabre. The most recently reported issues are listed below.
When the consumer attempted to apply the gas, the vehicle vibrated. The dealer was notified. The consumer knew of other Buicks with the same problem. There was shuddering in the transaxle (transmission) and required replacing the solenoid assembly. Gm was unwilling to resolve the problem.