DIC reports the issue only intermittently, when I let off the gas or slow down then give it more gas to speed up, after about 10 seconds it stops. There are no abnormal sounds coming from the engine, oil is full and oil pressure is normal. Does not do it all the time. If this has been an ongoing issue for the years then GM needs to either come up with a fix or at least correct the problem at no charge. While it's more annoying than anything it could cause a serious issue or accident.