1992 400E, idles fine, starts to severely stumble when gas is applied. Pulled these codes from it.

Pin 4- 4
Pin 6- nothing
Pin 7- 2,5,11
Pin 8- 10,11,12,13
Pin 17- 5
Pin 19- nothing

What do these codes tell you as far as my running problem is concerned?

Pin 4, DTC 4: Voltage at hot wire MAF sensor (B2/2) insufficient or too high, or open circuit in ground wire at hot wire MAF sensor.

Pin 7, DTC 2: EA/CC/ISC control module (N4/1) or safety contact switch (M16/1s1) or Stop Lamp switch or Cruise control switch or Actual value potentiometer or Starter lock-out/back-up lamp switch (S16/3) or Engine speed signal or Vehicle speed signal or Closed throttle position switch or Safety relay in EA/CC/ISC control module;
DTC 5: Stop Lamp switch (S9/1);
DTC 11: Fuel safety shut-off to LH-SFI control module.

Pin 8, DTC 10: Base module (N16/1) voltage supply output fuse F2 open circuit;
DTC 11 Base module (N16/1) voltage supply output fuse F3 open circuit; DTC 12: Base module (N16/1) voltage supply output fuse F1 open circuit; DTC 13: Base module (N16/1) voltage supply output fuse F4 open circuit.

Pin 17, DTC 5: Knock Sensor (A16) 1 and/or 2 defective Knock sensor not plugged in at Ign module: Replace knock sensor.

Courtesy of K6JRF Auto Page

I would clear all the codes and see which ones come back.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles