JOSEPH next time leave your car park for a fews day , before you try to start the car charge the battery up ,weak battery(loose juice after sitting for awhile) will cause car run rough at idle until altenator charge it up full ,OVP relay will cause hard to start or no start at all ; cooland temp sensor for the ECM or ECU which ever you call it's some time fail and computer don't know the engine is cold to provide richer fuel mixture when cold start . hoped this help , luan
