Battery light and misfires

[Kiolbassa]

So I’m having a really issue that I just can’t get figured out. I’ll be driving and under not real heavy acceleration, the car will miss real bad and the battery light will come on and lose most of its power along with what feels like the motor trying to jump out of the car. If you continue driving like this, the check engine will begin blinking and if you continue to drive from then, a P0303 and p0300 will come up AND I get no voltage reading from the primary O2 sensors AND the AC compressor turns off. Now, here’s the kicker, turn the car off and immediately back on, it will run like nothing is wrong. No battery light, nothing. That is until at some point during light to medium acceleration it will randomly happen again. Also, I noticed that during acceleration the HVAC buttons will flicker. Now I can let it sit and idle forever and it’s fine. Here’s another weird thing, the alternator is outputting 14.5v but when everything is fine, as soon as it starts missing again it puts out 13.2-13.5v. I’ve checked the main ground at the battery and I added a ground from the block to the body just to try and eliminate any grounding issues. Any help or input AT ALL would be appreciated!!

 

[joegr]

The best guess from that limited information, is that your alternator is starting to fail. Possibly, the brushes are wearing out? Anyway, it may be causing enough electrical noise that the PCM is getting confused, setting a misfire, and locking out fuel on the cylinder that it thinks is misfiring. Keep in mind that this is only a guess...

 

[Gunkk]

during light to medium acceleration it will randomly happen again.

Check the alternator belt tension. Might be slipping. Corroded wires, loose grounds, shorted wires caused by rats chewing on stuff they shouldn't can all do it too.

Also +1 to what jeogr said, alternators do fail. I replaced mine a year or so ago.