Howdy!

In the last week or so, my engine has started to take longer and longer to stop after I turn off the ignition. I would love to figure out what I need to clean/fix/replace before the motor decides it can run indefinitely without the key. Popping the hood and blocking the intake just seems like a lot of work that I don't want to do every time I use the car.

Can anyone point me to my likely points to inspect?

Thanks!
Tom Lynch

__________________
2016 E350 4matic wagon
2010 ML350 Bluetec
1995 E300D Gone, but not forgotten.