Car dropped 250 RPM and is now stuttering

I'm not able to play the video cause my phone's lame on data and won't stream vids very well at all.
Have you checked you alternator. Sometimes it won't put out enough voltage to run the car right but just enough to keep it alive
Well I have been taxing it since installing the MSD box. But it has been running fine up until now. I'm not sure why all the sudden it would just change.