Cylinder Misfires Code PO300 showing on OBD reader.

[gentlmac]

I have a 2006 Aveo Hatchback that misfires when you step on the gas or the weather gets damp. Anybody experience this. Any ideas on how to fix this problem before I take it to a mechanic

[avguy]

More information needed. Have you tried to diagnose at all? Maintenance history, such as spark plugs and wires? Any other recent repairs or issues?

[xintersecty]

heck it could be the oil leaking in the spark plug area again. The head cover gasket gets hot and leaks. Did you check your spark plugs?

[slayerized6]

Replace spark plugs and wires at minimum. Clean TPS and IAT sensors. Get battery tested and replace if necessary.