MAF location

There isn't one. Chrysler is the only manufacturer that never needed a mass air flow sensor to make their engines run right. The sensor that has the biggest say in fuel metering calculations is the MAP sensor, which basically measures intake manifold vacuum, but to be technically correct, it measures the air pressure inside the manifold. It is also used to measure barometric pressure when the ignition switch is turned on, but before the engine is cranked.

You didn't provide much for details, but if the engine will stay running if you hold the accelerator pedal down 1/4", and/or if the battery was recently disconnected or run dead, the Engine Computer will have lost its memory. Most of that data will be relearned as soon as you start driving, except for "minimum throttle". Until that is relearned, the engine may not start unless you hold the accelerator pedal down a little. It will tend to stall at stop signs or when shifted into gear. Idle speed will be too low.

A specific set of conditions must be seen for that relearn to take place. To meet those conditions, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.

Don't over-think that procedure. It is far more easy and simple than you would think. The people at most battery stores will either take the vehicle on a short test-drive after replacing the battery, or inform the owner of the need to do that, so they don't come back with a complaint of low idle that wasn't there before the battery was replaced. At the dealership, I had to drive about three miles, through four stop lights, to get to the stretch of road I used most often for test drives.

Today most battery stores use a memory-saver device to maintain the memories in the dozen of computers when they replace the battery. Chrysler is famous for a really long list of innovations that benefited the car owners. GM is famous for a long list of tricks they developed to cost owners money after the sale. One of those is designing computers that will lock up when the battery is disconnected or run dead. That is why the battery installers use those memory savers now when they replace a battery. Failure to do so night not cause any problem, but it is possible for some computers to have to be unlocked with a special scanner, and only the dealer can do that, for a charge, of course.

Your biggest clue was the engine doesn't stall while you're driving and holding the accelerator pedal down a little. To be clear, that is a quarter inch, not quarter way to the floor. If you hold the pedal down too far while trying to start the engine, the computer interprets that as "clear flood" mode, which goes back to the days of carburetors. It will cut off the injectors to dry the cylinders. That will result in a crank / no-start.

Even when owners aren't aware of the need to perform this procedure, it will correct itself eventually. It can take 20 - 30 seconds to coast down the typical off-ramp. That's more than enough for minimum throttle to be relearned. Basically, what the procedure does is to meet a number of conditions the computer compares to know for sure your foot is off the accelerator pedal. At that time it takes a reading from the throttle position sensor and puts it in memory. That is minimum throttle. From then on, any time it sees that same voltage, it knows your foot is not on the pedal, and it has to be in control of idle speed.