motor stumbles after it warms up

[Terebit]

I dug into the wiring some today. The A15 and A9 pins on the ECU are vacant (no wires attached). I grounded the A15 pin with no change to the glowing CEL (key on, engine not running). I'll need to find the blue/yellow wire for A15 and Violet for A9 to see if completing those circuits (with A15 grounded) will trigger the flash codes. - next time I have a chance to mess with it.