2004 DODGE Ram 1500 4.7 truck runs rough black smoke, low vacuum

Question edited for clarity.
Question moved to year make model category.

Good diagram here.

https://www.justanswer.com/dodge/7rd65-ram-2004-ram-4-7-need-diagram-vacuum-lines-i-disconected.html

Lots here with part numbers

https://www.google.com/search?q=2004+dodge+ram+1500+5.7+vacuum+line+diagram&rlz=1C1QJDB_enCA643CA644&sxsrf=ALiCzsYbFrf1V-BYUEuo3mInVYvYQ7t6WQ:1660420597687&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjyjpzfzMT5AhWlhIkEHS7ICKgQ_AUoAXoECAEQAw&biw=1920&bih=937&dpr=1

..

What color smoke? Black is emissions related, blue/black your burning oil and white your burning anti-freeze. With the "skip" your REF to, you probably have a bad spark plug, wire, or bad cylinder and burning some oil or coolant. CK plugs , wires & do a compression test. Pressure test Radiator for head gasket leak.

I would start there.

Is this correct, you have a silverado 1500 2004 that runs rough and black smoke out of exhaust, the check engine light on and how long has engine light been on?

sounds like you need an engine my friend or a good mechanic to rebuild that one

Head gasket is blown between cylinder and water passage.

If the engine seems to run fine over 1450 RPM maybe there is a vacuum hose leaking or EGR valve is slightly stuck open. Any help from the OBD II trouble codes? Or is there simply no MIL and no stored information in the OBD II computer read at the local parts store through the connector by the drivers knee?

It probably uses oil as well... The intake manifolds blow out a gasket on their underside all the time. This allows a vacuum leak and it sucks oil in as well... Intake has to come off to fix it.

Try the fuel filter,if not then the fuel pump maybe bad. That light will go on when the engine gets to a real low rpm,like stalling. Try that & come back if that doesn't solve it.

Take it to an Autozone or O'Reillys and they will test the computer for you. It should have set a code, but you don't know if the code light works so its your best bet. Sounds like it is running rich and the crankshaft module is not advancing the timing.