PDX 190E

Hello, So I recently purchased my first 190e after I crashed my 300e. Its a 1986 2.3. Its been a great car so far and I love it. It passed DEQ last week with no problems. Well on Saturday I was driving it and the "Check Engine" light came on. The Benz was still running and driving the same so I scheduled an appointment at the dealership for Wednesday. Heres where it gets weird, It was driving fine all day yesterday until I parked it on the street last night then I started it later on to put it in the driveway and it had a rough time starting, also had a low idle at .5, It felt super sluggish and I felt like the car would have stalled if I did not keep giving it gas. I have no idea what this could be, I replaced the Distributor cap 2 weeks ago.
Any help would be greatly appreciated! Im gonna try and putter over to a German autoshop by my house this morning but I'm really nervous driving it anywhere and don't want it to die on me.

MercedesDad

Have you changed the oil after you bought it? Checked the oil level?

It could be a number of things. Any noises?

LEISTUNG1

IT COULD BE OVERVOLTAGE RELAY IF THEY GO BAD AND CONTROL UNIT SHUTS DOWN IT MAY HAVE A BAD IDLE. CHECK THIS YOU CAN START THE CAR AND UNPLUG THE CISE CONTROL UNIT IF THERE IS NO CHANGE THEN THE CONTROL UNIT IS DOING NOTHING FOR THE RUNNING OF THE ENGINE AND I WOULD START WITH OVERVOLTAGE RELAY. THE CISE IS BEHIND THE BATTERY AND CLOSEST TO THE FIREWALL USUALLY BEHIND ABS.