Code name “Baby”

[GypsyDogs]

That was my first thought.. but
Just recently replaced both alternator and pcm.. (facepalm)
So either end of that function should be good… but- might not.

I am going to start with pulling and sparklifying battery connections and any ground in the engine I can find. And the pcm controller connection on the alternator (it might have picked up grunge during the last flooding of streets)

Also the levels of the spiking seem to be somewhat rpm dependant..
Thankfully, they only last for split seconds.. they don’t persist..