So my 2005 V6 Passat has had a hard time starting it left sitting in the cold for a few days in the past. I’ll start it and it’ll be fine hen but a rough start. Sometimes it’ll be tougher and it’ll run rough until I turn it off and back on. Today I went out after it sat all weekend and didn’t run at all. Uninsulated garage and running into the 20s at night. It took about 15 tries to get it started and then ran rough until it warmed up and I restarted it. I’ve already done the alternator a little while back. When it cranked it was really cranking too. Battery? Something else?