Hello, hoping for some guidance here. I took the car for a drive the other day, ran great for about 5 miles then started to run rough and lack power. I drove it back home and let it sit for the night. Started it back up the next day and engine was once again running smooth but did not take it out for a cruise to see if it started running rough again yet. I checked the error codes and found 931D h. Any ideas? I don't drive the car often and wondering if this could be old fuel or battery issue?? Just a guess. Thanks in advance for any advice.