1999 Chrysler Sebring Convertible stuttering and bucking

Hello Cartalk Folks

I have a 1999 Chrysler Sebring Convertible. It’s been to the mechanic six times. Each time he assures me it’s the spark plug wires, makes some adjustments, and send me on my way.

He hasn’t charged me these six times, but it’s taking up a lot of time!

The engine seems to run fine, but once it warms up, it will stutter and buck forward at stop lights. Acceleration is very stuttery until the engine “catches”

What else could be happening?