Rough idle after start up and occassionally the.

Scan for codes and check fuel pressure first. Then check for a vacuum leak. Also check for hoses with holes in them soft etc. Make sure the duct work ging to throttle body has no holes in it.

You'll hav eto check your evap cannister for a hose off or bad solenoid or incorrectly routed hoses.

302 is a missfire code for cylinder 2. It could be a plug, wire, coil, injector, vacuum leak or low compression. All these need to be checked to find the failure.

Roy

Based on the symptoms, the code and what this vehicle is I would suspect an intake leak when cold. Sometimes they only leak when cold then swell and seal up when warm.I would suggest that you take it and have a smoke test done by a shop.