Cadillac Repair: cad missing, climate control, word history

Question
QUESTION: check eng lite stays on also says service ign car runs find then it will just start missing sometimes badly

ANSWER: Do you know how to retrieve the codes from the computers via your climate control panel ?.

---------- FOLLOW-UP ----------

QUESTION: no i dont know how to do that

ANSWER: I need the YEAR, MODEL and is your speedometer an ANALOG (needle style) or a DIGITAL ?.


---------- FOLLOW-UP ----------

QUESTION: 1996  deville digital

Answer
1. Turn the ignition key to the ON position. Do NOT start the engine.

2. On your climate control panel you will simultaneously push and hold the OFF and WARMER (fan up) ^ button for 3 seconds and then release the buttons.

3. On your FUEL DATA display you will see codes being displayed as LETTERS & NUMBERS with each code followed by the word History or Current.

4. When the display stops at PCM, Turn ignition key OFF.

5. Tell me what codes you get.