Stalling

It is very very rare for an oxgen sensor to cause a no start condition. The conditions you mentioned will not cause a no start, but good thinking just the same.

Does the sister plug on that coil have spark? If you follow that wire back to the coil you'll see there are two wires on the coil.

You can swap the coils around to see if the missing spark stays at that cylinder (or cylinders) or follows the coil. If it follows the coil, this indicates the coil is bad.

I changed fuel filter thinking it was fuel. Now I can't even get it to fire with starting fluid. We should I begin to narrow down electrical system.

You need to check for spark during the no-start period. Is there spark?

Don't continue to use starting fluid trying to get the engine started. A little bit can be very dangerous, overuse really creates a hazard. The vapors can collect and be ignited by unknown ignition sources (ones your not expecting).

Have 12 v to ign module but nothing out to crank sensor. Checked coils for resistance and they are within specs. Ign module was checked good at Auto Zone (twice). Checked continuity on lead to crank sensor. Thinking it is computer, I opened it up to see the circuit board was burnt but looks ok. Is computer my final try?

How did you test the crank sensor? Hook your meter to the crank sensor (AC volts) and crank the engine. You should be getting, at the least, 500 mV. Alternatively, engine not cranking, hook your ohm meter to the sensor. An open or shorted condition is a sure sign of failure.

Do you hear the normal array of relays clicking when you first turn the key on? If not there is a good chance the crank sensor has failed. This is a very common failure on your car.

Don't overlook the wiring to the ignition module.

Car is idling high when starting in the morning and car is revving up and down, then car will shut off. It starts back up and when put in drive will shut off. Also stalls at stoplights. What is this part in red called? The yellow is the IAC (not my car but is the same 3.1 engine). The red line shows where one of the three black lines is cut in half. Could this be the cause of my problems?

My car is wanting to go without me really pushing on the gas and the gas fumes are awful due to the exhaust. Used to require pushing on gas when starting but now doesnt but seems to want to shut off when first starting and backing up. Sometimes when first starting up and the ac is on it smells like unburnt gas