I am suspecting one of the drive shaft donuts.When I put the shifter in neutral to let it coast to the red light, I feel a vibration in the steering wheel. Put it back in "D" it goes away.
I don't really have a suggestion other than I doubt that something towards the back like that will much affect the steering wheel. I suspect the engine is running ratty for some reason under those conditions. What is the characteristic as you coast fully to a stop? -- Jim