P0304 code

[mykcorleone]

I recently got P0304 code. I replaced the plug and the coil but still jerking and getting the code. Any ideas what this could be? Any suggestions would help

[Pelican Parts]

Check out these as possible troubleshoots as well:

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