I have a hyundia accent 2003 my coil pack keeps going out and misfires on all 4 cylinder and also has several random misfires. I have replaced coil several times and it goes bad very quickly, what could be causing it to go bad?

SOURCE: 2003 Hyundai Accent with Engine skip...error code P0300 P0301

I have seen coil packs go bad on several Hyundai Accents, the coils will do exactly what they are supposed to (hence your check with an ohm meter), however, the coils short through the outer casing. Try running the car when it is dark out and spraying the coil packs with water. Listen for clicking and watch for arching from the coils to any metal around them. Look for abnormal detonation marks in the outer casing. My guess is you just need a set of new coils. If the Problem is worse in the rain then you have found your problem. Remember, If your car has been misfiring (as noted by the engine codes you listed), the EGR valve can become clogged and damage can be done to your catalytic converter as unburned fuel detonates inside it (keep an eye out for O2 codes in the future). Also, your new plugs can become fouled, be sure they are clean once you fix the problem. Checking your plugs can also be a useful indication of which cylinder is misbehaving.

SOURCE: my 2000 hyundai acc

Possibly coils check compression make sure the plugs are the proper ones some engines are particuler about the plugs

SOURCE: stalling and hesitation, all 4 cylinders misfiring, once warmed car seems to run ok

There are various questions to ask in order to help you.
When does it stall?

If it stalls when the AC of the car turns on, then this handy diagnostic article will help solve your problem:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Engine_System_Engine_Stalls_When_AC_Turned_On.htm

Likely applicable to your situation--since you say the car runs fine when it is "warmed up"--when the car stalls because the engine is NOT warmed up and is otherwise cold, this handy diagnostic article will help solve your problem:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Engine_System_Engine_Stalls_When_Cold.htm

And as to backfiring when you initially run your car, this handy article really helps in identifying the common causes of such a problem:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Engine_System_Engine_Backfires.htm

This should help.
Good luck!
Brad

SOURCE: 2002 accent 1.5 no spark..replaced coil pack

hook up a scanner if you have one, check to see if your scanner is registering a crank signal.

SOURCE: have misfire in cylinder 4 and 6. I have replaced

2003 hunday santa fe cylinder missfire on 2 4 6