Have bigger problems now.Something is blown after the spikes.

I put the new (95 DSM) alternator in. She started up but took some coaxing. Idled like crap. It finally stalled out about 2 mins into warm up. During that though.. good news is.. the alternator I got today is putting out a solid 14.2 volts (looks like an original DSM alt)

Anyway.. I can't keep it running without giving it gas (and she stumbles while doing it). Before I rip the ECU out to send to ECMTuning for a checkup, is there anything else I should check?

I tried replacing the PTU with a spare I had. No change. She doesn't want to stay running. Any tips on things to check would be greatly appreciated.