Went from no start to high reving on it's own!

1999 Olds Aurora.
This car has had a problem with rough starting for months now. It often takes 10-15 seconds for the engine to start after turn over without giving it any gas.
Changed the fuel pump with a used one about 2 months ago.
Just changed the water pump and drove the car over 1500 miles on a trip. Got back drove it around town a bit and then it wouldn't start. It would just turn over. Before this the lights started going kinda wacky with the traction off and anti lock brake lights coming on.
After trying over and over to start it, sprayed carb cleaner in the air intake or at least down the hose from the air filter, and it got to right where it sounded like it was starting to start and then something popped and some smoke came out of the passenger side of the engine. Then tried some starter fluid sprayed in the same spot. It would start popping when it was starting to start. A small fire started right near the air filer.

Left it overnight. Tried to check security by locking and unlocking the door with the key. Still wouldn't start and battery was dying. Got a fuel pressure gauge but wasn't sure where to hook it up. Hooked it up at the port right above the fuel injectors on the opposite side of the engine as the Fuel Regulator. The gauge read zero with the key turned on. When pressing in the port no gas came out. Changed the fuel pressure regulator and changed the fuel pump (another used one). Had to jump the car at this point. It would continue to turn over but then when it was just about to start it kept popping. Thinking that was backfire in the intake. After doing this a few times, tried to turn it over while stepping on the gas. Pretty sure it started and was then lightly stepping on the gas trying to keep it going. It suddenly started reving on it's own with the RPM's jumping to the max and then back down over and over till shut key off. Tried two more times and each time it automatically jumped to Reving on it's own and had to shut it off at the key to get it to stop!
Not sure if we blew something w/the carb cleaner and starting fluid. Checked the throttle and it's not stuck.
Now when pressing on the port gas does come out.
Not sure where to go from here!