Cadillac Repair: codes, vacuum line, faulty computer

Question
QUESTION: what do these codes mean?
PO34
Po71
PO91
PO110

ANSWER: PO34 = manifold absolute pressure (MAP) signal to high.

Po71 = Intermittent MAP signal.

PO91 = Transaxle range switch (neutral starter safety
      switch) signal problem.

PO110 = no such code.


What is the YEAR and MODEL and ENGINE SIZE of the vehicle ?.

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

QUESTION: this is a 1994 concours with a 4.6 northstar,  If i replaced the map within the last 6 months is there anything else that would cause these codes to come up??

Answer
Cracked, soft, or partially pluggede vacuum line to the MAP sensor. Possible faulty computer or related wiring.

P0110 = Generator (alternator) "L" terminal circuit problem.

FIRST CLEAR all the codes from the computer via the climate control panel and see which codes re-appear.