Engine low power

I fixed a misfire in the car and had no codes. On my way to work during a snowstorm the car when it shifted started losing power and throwing a misfire code a long shift code a ebtcm internal fault code and battery low voltage code all came on at the same time.
The miss isn't constant its intermittent.
The codes are:
B1327
C1255
P0300
P1811

That could cause a misfire and have the car do all the other weird things and throw the codes?

Okay, thank you very much!

The engine stalls, idles irradically, loses power in first gear, what causes this

Throttle position sensor. It tells the fuel system how much fuel to push through the engine. When it goes bad, it just runs like crap. Replace it, and it fixes a lot.

Idles rough an when I step on accelerator it rpm's drop below 600. I've replaced ICM, coil packs, plugs an plug wires, camshaft position sensor. It will randomly run okay.

Runs good on flat ground, but on a hill has no power, misses and has a whining sound.

1992 Buick Park Ave ultra 3.8l super charged mileage: 143,000. Easy highway miles, car drives like new except: Only when engine fully warm, at highway speeds, motor bogs down when I step on the gas. Instead of a downshift and power surge, the tachometer indicates slower rpm, and the engine decelerates the car. If I keep my foot on the gas, I hear a clanking from the engine. The only way to resume acceleration (or just maintain speed) is to let off the gas and or downshift manually. Just put in new plugs, fuel filter, air filter (all were in bad shape). But problem persists. When problem is really bad, it will even happen if I rev the engine in neutral (while rolling down the highway at 60 mph). No mechanics can identify the problem (supercharger?), And this car is too good to let go of. Please help. Thanks.

Check the catalytic converter to make sure it is not “plugged” or restricted. Your car is equipped with a computer controlled engine management system. An independent auto service center can scan your computer for fault or error codes. The information should pinpoint the mal functioning components.

Engine Performance problem
1991 Buick Park Avenue 6 cyl Automatic

Driving normal on a three lane street when all of a sudden the car began to accelerate, without my doing it. It got so bad I almost burned out my brakes trying to stop before running into back of another car. I pulled into a station, stopped the car, lifted the hood, moved the accelerator link a few times, got back in the car and had no problem since. What could have happened, could it happen again?

After changing the coil, the battery, and the alternator my car does a little better, but it still has this problem of random stalling, slow acceleration no matter how hard I push the gas, and loss of engine power. And it idles high with putting until it finally shuts off.