I have a 1992 SC400 all stock except new wheels, a stereo system, and seats. It has 132K miles on it.
When I first start the car, it runs fine. for about a minute... the the check engine light comes on, the TRAC light comes on and I’m unable to use the button to turn it off. On top of this, my engine begins missing out and I’m left with half the power. Which isn’t all that big of a deal, but the rumbling from the miss is what really annoys me to death.

PS: one more problem. When I roll my windows down, the lights in the dash are dimmed and I can hear the AC slow down as if it’s not blowing as hard. Obviously the issue is electric, but what should I try first?

PS: Any help is much appreciated because I don’t have much experience with cars.

thanks, I’ll do that and send back the results

I had the battery tested, and the alternator. The Advanced auto parts employee said both seemed to be working fine. So I’m still not sure what the issue is