'92 Deville black smoke runs rough

[pounddrivebandvan]

Hey everyone, I have a 1992 Deville thats running rough unless you rev it and then you get clouds of black smoke. Smells really rich. Checked the codes and only got a 52 and 91. Oil and antifreeze check out ok so I dont think its a head gasket but I'm not sure what is making it run so poorly. It ran fine for years and this happened the next day. Anyone with any ideas please post!

[maxwedge]

Running to rich: high fuel pressure, low /no vacuum to map sensor, stuck injector, just some of many issues for an engine running rich, do a full on board diagnostic look at sensor inputs.

[pounddrivebandvan]

I'll start checking sensor voltages, think it could be a faulty pressure regulator or fuel pump?

[maxwedge]

Could be the reg., not the fuel pump