What will cause it to stall and not start back up

Have you checked for diagnostic fault codes? Have you checked for spark and fuel pressure?

Do you have a voltmeter or test light? We can do all the testing by breaking the system down into four parts, each with a test point in the starter relay socket under the hood.

The 3.2 is a fine engine.

From your descriptions, you have two different problems that are likely related. The place to start is by measuring the battery voltage with the engine off and with it running, if possible. You could have a charging system problem, and bad connection, or something as simple as a bad battery.

Most likely a bad connection. One common place is where the smaller positive battery cable bolts to the under-hood fuse box.

You can measure the battery voltage at the test points on the driver's side under the hood without removing the battery. For those with the battery under the fender, turn the tires to the right to provide room to access the plastic shield and remove it.

You're still describing multiple symptoms. A battery problem will prevent the starter from working and the gauges may do weird things, but it is possible for the radio and lights to still work.

Once the battery and starter are working, THEN you could have a no-start condition meaning the engine cranks okay but won't run. A common cause of that is a failed camshaft position sensor or crankshaft position sensor.

The 3.2L engine uses a timing belt that could jump a tooth or two. There should be a diagnostic fault code stored related to that if that happens. The Engine Computer may prevent the engine from starting to protect it from bending the valves.