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Q: Its Gotta be electrical?? Help!! on 2001 Hyundai Sonata

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I have a 4 cyl 2001 Hyundai Sonata. It has been sputtering, missing, and all around running like crap. When I pull away from the curb it will accelerate normally but then it pretty much stalls and then if I keep my foot the same on the pedal it will catch itself at the exact point of acceleration. I JUST changed all my plugs, wires, AND BOTH coils!! Nothing has really changed. I am so frustrated that I just made an appointment with the nearest Hyundai Dealership (in WAUSAU WI!!) I live in Northern WI. I am wondering if anyone has any idea what this could be?? I had a generic Diagnostics done before I changed the coils and stuff and it said misfire 3rd cylander. So they said to change all that stuff...So I spent 300 bucks and did, and that is not it. It seems like it is something electrical to me but I am at a loss at this point what it could be or if I could fix it myself or should I just keep the friggin appt at the Dealership and just get it fixed by pros!!?? Any info would be a big help...I like fixing things myself, but this one has me frustrated. Thanks folks!
Common Problems that Trigger the P0303:
Worn out Spark Plugs Ignition Wires, Coil(s), Distributor Cap and Rotor (when applicable)
Incorrect Ignition Timing
Vacuum Leak(s)
Low or Weak Fuel Pressure
Improperly functioning EGR System
Defective Mass Air Flow Sensor
Defective Crankshaft and/or Camshaft Sensor
Defective Throttle Position Sensor
Mechanical Engine Problems i.e Low Compression, Leaking Head Gasket(s) or Valve Problems
Please check out this information about this fault:
I always prefer to diagnose before replacing parts, and the person who recommended those repairs didn't do you any favors! If it was a repair shop that recommended replacing all those parts without a proper diagnosis, please review their shop in our shop directory to warn others about their tactics.
Can you post the codes they pulled from the computer? Are the same codes re-appearing after replacing all the parts? The next step is to check for vacuum leaks near the #3 cylinder, especially the intake manifold. Perform a compression check of the cylinders.

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