There is no pcv valve.

The vacuum line from the fuel pressure regulator is supposed to go into that black hose.

Clean the buildup on the inside of the distributor cap. You will need a hard tool like a screwdriver to scrape it off.

Inspect the orange "insulating disc" behind the ignition rotor.

The proper non-resistor plugs are no longer made. I run new old stock plugs in my m103. You can still find them on ebay.

The ignition wires are supposed to have 1k ohm resistance. 2k if you measure from the cap. Coil wire has no resistance.

Injectors aren't serviceable.

There are tests to check your fuel pump/filter/accumulator.