My car struggles to go from first gear but once going everything seems fine...I've replaced my spark plugs and wire set, fuel filter, o2 sensor and still having problems...my check engine light is

SOURCE: Car misses and cuts out!!!

Ron

It sounds like you have done everything Unfortunately it is hard to diagnose because al of the above is what I would have done

I have a 2000 Hyundai Elantra and had a similar problem and I took the car to Cotterman transmission
(because it would hardly go engine rattled and lurched and stalled) they put an electronic diagnostic and said I had a mis fire on cylinder 2 and 4

I bought the best spark plug wire and boot kit and 4 plugs and replaced and it runs like a top!

It almost sounds like you have bad gas I would remove the air cleaner and spray starting fluid
into the carb while car is running ad see f it smooths out this will tell you if it is gas



Best of luck

SOURCE: 2000 Hyundai Accent will suddenly stall and wont restart

Have someone check the idle sensor. I had to have mine replaced along with another that I don't remember which one is was.

SOURCE: more fuel consumpion

No codes? Checklist: MAF: Mass Air Flow Sensor, MAP: Manifold Absolute Pressure Sensor, Engine Valves/Low cylinder compression, Fuel Injectors, Fuel Pressure, Tire pressure, vacuum leak(s), PCV: Polution Control Valve, Purge Control Solenoid Valve PCSV stuck open/leaking, Intake Air Hose leaking, Engine Coolant Temperature Sensor, Intake Air Temperature Sensor, etc. etc. etc..
Go to http://www.hmaservice.com/ and register (vehicle by VIN). Afterward, you'll have access to technical information (manuals, wiring diagrams, service bulletins, etc) about your vehicle.

SOURCE: 2003 Hyundai Sonata with 4

P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

SOURCE: check engine light is on...have

Some check engine lights need to be reset by the OBD-II code reader. It's also possible that you've solved 98% of your problem but there's still 1 problem left (possible clogged fuel injector?) that's pulling a different error code. (possibly P0301-P0312 misfire or P0262-P0295 injector)

Best bet is to go to 1 of the auto parts chain stores that provide free diagnostic tests. If it's just a lingering old error code it will be reset or if it's something new, you'll know exactly what the issue is.