I have a S420 that starts well and drives for about 2 miles of town driving when stoped at lights car may seem to missfire or miss a beat.on take off it seems under powered engine might cut at this point when you try to restart engine will not re start i have good fuel pressure and delevery.If car is left for a few hours it will start and drive no problem.I also feel that when car is hot if it is turned off it is hard to start again ,alot of swing but no start eventualy it will start.

hope someone can help