Let me give you a bit of background before I get to the recent problem.
5 weeks ago I needed a jump start because the battery was drained. Also, the terminals were really corroded. Took it to Autozone where they cleaned the corrosion and tested the battery. Battery (about 3-4 years old) tested fine. The alternator tester was broken so I didn’t know about that. But they guy said the corrosion could have been keeping the battery from making a good connection, so we figured that’s what caused the problem.
Everything was fine for 5 weeks until yesterday. My car sat unused for about 4 days until I went to start it up yesterday evening. Battery was completely dead. I got a jumpstart, but noticed the car idling really low, like around 500 rpm. I wasn’t able to drive it around long because I was late for a meeting. So I drove for 10 minutes to the meeting, then got another jumpstart afterward and took it to Autozone.
The low idle caused me to stall twice. I eventually had to shift to neutral at stoplights to keep the engine revved high enough so it wouldn’t stall.
Autozone checked the battery and alternator and said both we fine. So I don’t know why my battery died in the first place. And now I have this low idle issue added on. I haven’t driven it since last night, so I don’t know if it’s still a problem today.
So, my questions are: what could be causing my battery to drain or not properly charge if not the alternator or battery? And what might be causing my idle to be so low? And could these two be related?
Thanks for any advice!