> When my D is warming up from a cold start. The engine idles up and down > like someone is playing with the gas paddle. >I do not know of any other car that behave that way. Two of my cars (a 1992 Volkswagen Corrado G60 and 1995 BMW 325i) do the identical thing. I can't answer "why", but it is normal, and happens with other vehicles. -Hank