My 2000 hyundai acc

P0300 multiple misfire
P0302 misfire cylinder 2
P0306 misfire cylinder 6

Codes p0300 random misfire, p0302-0304 misfire cylinder 2-4. P0133 o2 circuit slow response bank 1 sensor 1. P1176, P1300, P1580, P1543, B0423 r make specific which you didn't say this would cause the problems you are having.

miss fire check coils or plugs

P0300 = Random/multiple cylinder(s) - misfire detected.
P0302 = Cylinder 2 - misfire detected.
P0304 = Cylinder 4 - misfire detected.
P0306 = Cylinder 6 - misfire detected.

A misfire can be caused by a few things. The most common causes are usually spark supply or fuel supply. Get BOTH of these checked.
All the misfires are on the same side of the engine so I would suspect a fuel rail or an injector issue on that side of the engine.

that particular vehicle has a distributor-less ignition system. completely stand alone and electronic. change around the known good coils and see if the misfires on the computer change. see, what the trouble codes say is your numbers 1 thru 4 cylinders are misfiring inadvertently. if you move the coils around, which there are 4..one to 2 cylinders and if its 4 bad coils giving problems then the codes will move around. it could be the crankshaft tone wheel or the PCM as well. take it to a good diagnostic facility like a hyundai facility if you want it fixed right the first time. the hyundai parts are a little more expensive but they are the BEST part for your car, OEM parts are the way to go and the mechanic has probably seen this before and can tell you whats wrong before you leave easily.

p0300 random multiple cylinder misfire, 301 is cylinder 1 misfire and 302 is cylinder 2 misfire. p0600 is a communication link fault.

Im assuming your asking about the ODB-II codes, this code,P0300 Random/Multiple Cylinder Misfire Detected.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
Here are a few things that could be the cause.

Faulty spark plugs or wires

Faulty coil (pack)

Faulty oxygen sensor(s)

Faulty fuel injector(s)

Burned exhaust valve

Faulty catalytic converter(s)

Stuck/blocked EGR valve / passages

Faulty camshaft position sensor

Defective computer

I would start things out with a tune up, new plugs and wires, wires break down after time and could be grounding out, or arcing between themselves causing a misfire.

You describe a 'Misfire' condition. You'll need and OBD!! scanner to retireve any throuble codes stored in the ECU (Engine Control Unit). Once you know which/what code (i.e., P0300 - Random Misfire Detected, or P0302 - Cylinder #2 misfire detected, etc). then you'll know where to go from there - plugs, wires, coil(s), etc.