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Message: <blockquote data-quote="FivepointSlow" data-source="post: 1451155" data-attributes="member: 18995">So on Thursday I drove the car to work. Battery was dead when I went to leave because I left my dashcam backup battery plugged in, no buggy I've done it before, jump it, starts right up. Go to head out to lunch while at work, batteries dead again, but the dashcam wasn't plugged in.. weird, whatever jumped it and started right up, only now my speedometer isn't working and I hear the car backfiring a little when decelerating.. okay whatever. Leave work (battery isn't dead this time) and on the drive home I notice my odometer isn't working, and I notice its backfiring on decel about the same as a ricer with one of those crackle tunes... now I'm genuinely concerned... I narrowed it down to happen in any gear, only under 2000 RPM. And then if I am rolling up to a stop and decel to under 1100 rpm before pushing the clutch in, the engine continues to decel til about 400 where it dies, unless I catch it with a blip of the gas, and then it idles fine..THEN I pop a CEL just before my house, and while I'm sitting in my driveway idling trying to connect my new phone to my bluetooth obdii scanner, I notice the dash lights are dimming, then they turn off, headlights start to dim, then radio goes out, then it starts to try and stall out, I gave it some gas for awhile and turned the AC off and then everything went back to normal.It was acting like it didn't have a battery in the car and the alt was weak.CEL was for no signal from the speed sensor, which I'm thinking may be something funky going on with the speed calibration tool? I know that receives constant power.. but I'm not sure. My question really is would the speed sensor not communicating to the car cause the car to think it's always idling and parked, and then in turn cause a rich mixture and the back firing under 2000k while decelerating?And no I did not jump it backwards.YouTube video of the backfiring[MEDIA=youtube]y5LusYUXftk[/MEDIA]</blockquote>