Hey everyone....
I swapped out my fried transmission over the past week or so and now I have erratic engine performance and electrical issues. For example occasionally the car will spit and sputter and act like it running on only half power. When I come to a stop sometimes it will idle down and stall. I have always been able to start it back up…. The RPM’s will fluctuate and the car will kick real badly. When this occurs typically I’ll get some electrical issues as well…. Not all at the same time but they vary from the heads up display changing the speed up to 100 and something then down to 0 and back up… The MPG computer will read all 0’s. The tachometer and speedometer will jump all over. The TSC light will come on. The rear windows won’t roll down.

With all this being said I drove to work this morning – 45 miles and I didn’t have a single issue??????

From what I’ve read I believe it to be an issue with the battery, ignition switch, or the alternator

How do you determine if the ignition switch is bad?

Thanks everyone for taking a look.