Does the hesitation stop once it reaches operating temperture? I do not want to mis lead you any and driff away from the code you gave me (11). Things I would check.
1) spark plugs & wires
2) rotor and cap
3 02 sensor
4) Tempture sensor at rear of motor on left side. this sends information to the CPU to tell it to run in a richer mode when cold or WOT. until the catallic converter can heat up and the emission devices become closed loop.
5) EGR vacuum valve could be a bad vacuum line
You may need to pull some of these items and measure resistence on them ie tempture sensor measure resistence according to the the work shop manual
6) does the engine shut off and the warring lights go on and then you restart the car? check the over voltage protect relay behine the battery it could be the two fuses on top or if you can unplug it ignition off if it ratltles its bad.
Send me your email address and I will send you a copy of the page I found from the predelivery manual for 1992 model W124. Hopefully some other member can chime in and add to what I have said. There are I am sure others who experienced this problem.
Good Luck
Bob Geco
Bob Geco