Chrysler Repair: Heat soak sputter or no start on 95 Intrepid 3.3, throttle position sensor, coolant temp

Question
My 1995 Intrepid 3.3 "T" engine with 167,000 miles just recently failed to start after a warm shut down. What I now think was just a coincidence was it starting after tapping the coil pack. I now think it was the cooling off of whatever was at fault. Initially codes of 24, 33 and 54 prompted me to replace the throttle position sensor. The car would usually start after cycling the key but today after driving about 20 miles it wouldn't. Well actually it started for a second then sputtered and died. The new series of codes are 24,22,21,54 and 33. I know it is not getting reference to trigger the coils because I can get a spark from cycling the key but not cranking. Of course after getting home and it being cold it started. My former experience as an ASE tech with GM products makes me thing more of an ECU problem rather than just cam or crank sensors, because of the multiple codes. What are your experiences telling you?

Answer
21 is 02 sensor related including short to voltage/ground/heater failure/stuck
22 is Engine coolant temp sensor too high or low
24 can be: TPS does not agree with MAP sensor
33 deals with the a/c pressure transducer voltage being too high or low
54 no cam signal at PCM

I would verify that you've got all of the reference voltages present on these components.  Anything less than the 5 or 8 volts COULD be causing irratic codes.

Check the ground straps for the computer as well (follow the pin-outs and verify that a PCM ground wire leads to a good ground and has no corrosion).

Next I would unplug the a/c pressure transducer.  If it's pulling down the reference voltage or backfeeding voltage on the ground circuit then all of your signals will be out of wack.

Unplug the o2 sensor as well.  At initial start-up, engine cold, the computer should be running off of almost all of it's sensors except the o2.  Verify that the heater circuit has battery voltage at initial key on, the o2 signal circuit has 1.5 volts or less (normal range is 0-1 volts)

Check large engine harness connectors and make sure there's not a group of commong wires going through one connector that is either eat up with battery acid or other form of damage say from an animal chewing on it.

This sounds alot like a common denominator kind of deal like 1 connector with multiple wires or, as you suggested a computer that's going out.
Doug