[scottfab]

There is a large diaphragm above the battery.
Check the vacuum hose that runs to it.
It gets brittle being just above the battery and can
develop a leak.

If that seems ok, with the car idling pull in on the diaphragm.
The car should rev.

From there if all is ok then you need to get a code reader or
scanner and read the error codes out and tell us what they are.
Places like Autozone will do it free.
Else we can point you at a procedure that you can read them out
on the dash by shorting to pins together.
Welcome to the group. Be patient. There are many things to learn
if you are willing.