Chrysler Repair: 88 RWD 5th Ave.: starting issues, powertrain control module, wheel drive car

Question
Hi, I have a 1988 Chrysler 5th ave. with 318 and rear wheel drive. Car shows about 99,000 mi. but I think it is more. The car will start at -20 or +90 degrees, however once the engine gets warm after driving several miles it wort start. If I try and start it immediately after shutting down, it will start, however after about 5 minutes or so, it don't start. It will fire and die,then it wont start. After waiting 20-30 minutes, it will fire but not start. After waiting 50-60 minutes, it will start right up and run great.  So it seems like something to do with a sensor or something? It turns over really fast, but just wont fire, acts like spark or fuel problems. During the wait, I had my wife try and start the car while I held the end of the coil wire to check for spark against metal on the car, and I did have spark. I also took the cover off the air cleaner and had her pump the accelerator and I watched for fuel. There was gas coming into the carburetor when she did that. I also held the accelerator pedal down to evacuate the fuel, thinking maybe I had flooded it, but that didn't help either. it will turn over like crazy I have replaced the fuel filter thinking maybe that was getting plugged, but the problem has occurred since. Any idea what to look at? Thanks for your help, Brian.

Answer
Hi Brian,
Unfortunately I don't specialize in carbureted engines. Nor do I have any wiring diagrams that would show what sort or sensors would be involved that could modify the spark timing or the mixture. It could be a mixture problem or possibly a spark timing problem. I can take a look at an '83 manual that I have to see if there is something I might suggest. Do you know if there is a powertrain control module on the vehicle that might have self-diagnostic capability and show fault codes? That would be a great help if so. But as I don't claim to be expert in the rear wheel drive/carbureted Chrysler lines this is the best I can offer.
Roland
PS Based on my experience with carburetors, what it could be a choke valve that is closing to quickly after you shut down the engine so that the mixture is too rich to sustain an idle. The choke valve should be set so as not to shut down significantly from full open, shortly after you shut off the engine. It should only close significantly when the engine has cooled down significantly. So try changing the adjuster on the choke if it has one.