91 firebird wont stay running

[GatorIsaac]

Sounds familiar

I am resurrecting my 1991 GTA after leaing it sit for two years. I ran a dose of Seafoam through the PCV valve and fil the tank (something I've done regularly to all of my cars). Within 100 miles she began showing symptoms similar to yours. It still runs when warm/hot but only hits on 6 or 7....shakes like an earthquake. After following this forum and the included links I will be checking my injectors. Wonder if the Seafoam forced some garbage into the injectors?
I'll post here when I learn something more.

 

[GatorIsaac]

I checked resistance on the injectors. Cold readings run from 4.8 to 16.4. Three of them test under 11.8. I will check them again when hot.