Z24 runs ruff at idel

-scan for trouble codes -check air filter --map sensor [clean if dirty ] vacuum leak --cat converter--fuel filter

The basics for a rough idle, check for a leak of some kind, fuel--egr--vac leak. As far as idle, you can check and clean idle air system.
The basics for problems at higher rpms, check for a blockage of some kind, fuel--air--exhaust.
How long since a tune-up? Any applicable trouble codes?

May have ruined the fuel pump

yes there is an idel adjustment by the carbs
you need to bring up the idle to 850 - 900 rpm in gear,,,

Plugged air filter - replace.

Dirty throttle body and idle/air control motor - Can of Carb. cleaner sprayed into throttle body and idle/air hole while engine is running.

If engine is also running rough check:
-Spark Plugs.
-Compression for bad valve.

First run a tank of a strong fuel system cleaner like BG-44K. If that doesn't help, clean the throttle body. If that doesn't help, take it to a mechanic.

its vapor locking try leaving the fuel cap a little lose!!!!

sounds like dirty injectors......

sounds like plugs or wires got small crack or breaks from heat fatigue