Beretta.net

3.1 3 speed 1990
Today while making a junkyard ru n, the indy was running good. We got out of the yard and started it up and it ran around 400 to 600 rpm very rough. There was no oil pressure. When the car was restarted itt ran for about 3 seconds before it shut off again. I was leaning towards a oil pump but im not sure. Any ideas?

I would have jumped straight to a dead oil pressure sender, but I'm not sure if it would cause the engine to idle rough, it would normally just shut the vehicle off. This sensor is what's preventing the engine from starting, as a fail-safe for inevitable engine damage.

Otherwise, It sounds like a bad oil pump/broken pickup tube or...I hate to say this...you may have spun a rod bearing

You don't know until you check it out, hopefully this is something you can do on your own, get someone to help you with or have money and time to have it done at a garage.

Id start with the simple.. change out your oil sending unit