Chrysler Repair: 1996 Sebring: Engine bogs down at 60+ mph, obd ii, computer brain

Question
Ok I have taken my car to 2 different mechanics and broke down 3 times now And still they can't find anything on their computer readout but misfire...What happens is I drive around for 2 to 3 hours and If I get on the expressway(always after I am going 60mph)The car after about 15 to 20 minutes will just bog completely out ..feels like it isnt getting gas..then you push your foot all the way down and the car just loses all speed...and once the wrecker driver brings it home or to the shop after it has cooled down and comes back on...Please help...I am thinking about trading this car in because of this...but I have already replaced so much...so I don't know what to do...Now I had another mechanic tell me the computer brain last night....I hope you can help!!Thanks

Answer
Hi Julie,
I would not do anything to the electronics (computer brain) unless there was hard evidence that a fault code pointing to that as the cause is present in the memory of the module. You can often get a free readout of the memory at an Autozone Parts store, or for around $40 at an independent garage.
'96 was the year that the newer code system (called OBD-II) was adopted and there will be a code for a bad "computer brain" if that is the issue (code is P0600 or 0601).
You may also be able to get an OBD-I code readout using your ignition key: "on-off-on-off-on and leave on" doing that switching in an elapsed time of 5 seconds or less. Then watch the "check engine" light which will remain 'on' to begin to flash, pause, flash, etc. Count the number of flashes before each pause. Then repeat to verify the counts. The last two sets of flashes will be 5 in each. If you then group the number in pairs in the order they appeared you will get two-digit numbers that are the fault codes in that earlier system. The last code is 55 which means end of readout. If another code is 53, that would mean you have a "brain" problem. Otherwise, tell me what codes you get and we'll go from there. There is also a code translator at www.Allpar.com/fix/codes.html  I can't be certain the key will get you the codes, but give it a try.
I have one suggestion, though, for what you describe (bogging down when you are going at highway speeds): the catalytic converter may be clogged up due to a deteriorated honeycomb element which blocks the exhaust gas from escaping and thus backs up the engine from properly releasing the exhaust gases from the combustion chambers. It will often cause 'backfiring', but that symptom is not necessary for this to be the cause of your problem. The impact of such a clogged exhaust is most notable at high speeds. You can have your converter tested at an independent exhaust system shop where they will measure the pressure on either side of the converter via ports for that purpose. I would avoid nationwide franchise exhaust shops as they often will recommend repairs that aren't necessary.  
So consider having that catalytic converter test done. Otherwise, stick to the code approach until something definitive appears. Don't give up on your car yet!
Roland