1997 hyundai accent loss of power

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: Car failed emissions test with "#1 cylinder misfiring". Will start by replacing plug and plug wire, but don't know which is #1 cylinder.

It's the first cylinder on the motor from front(belts alternator) to back(transmission).

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: 2001 accent low prm power loss

buy new spark plugs. i had same problem

SOURCE: my 1997 hyudai accent has a missfire code on

Main causes of misfire would be loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.

Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

You can isolate the weak cylinder by temporarily disconnecting each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.

Testimonial: "did the spark test found two plugs to be weak. what would be my next step. "