Cadillac Repair: 1994 Fleetwood Service Engine Soon light, number combinations, climate control

Question
My 1994 Fleetwood drives perfectly. It has 245xxx miles on it and I will take it anywhere. Just last night I was on the way home when I passed a car and the "Service Engine Soon" light came on. The car gets a little sluggish at take off when the light is on. But it goes off sometimes and the engine runs as good as ever. But the light will come back on at random and the car will get sluggish again. Could I PLEASE get some help and advice about this? I heard you were "The Best". Thanx a lot----JB
By the way...the engine is the 5.7 LT1

Answer
Perform this test:

1. Ignition ON, Engine OFF.

2. Simultaneouisly push and hold the OFF and WARMER buttons on the climate control panel for 3 seconds and release them.

3. On the display you will see CODES appaering as LETTER and NUMBER combinations along with the word CURRENT or HISTORY when each code displays.

4. I need to know the EXACT codes that display in the EXACT order in which they dispaly as if you were video taping them.

5. The display will stop at PCM?

6. turn ignition OFF.