Take the head off and replace BOTH valves.
Sounds like the fuel inlet valve is stuck shut, or the float isn't working properly.
If the egr valve was stuck open, the engine wouldn't idle. If the egr valve was stuck closed you may hear excessive pinging (spark knock) and in most vehicles, the check engine light would illuminate.
If the engine were to backfire for whatever reason and the pcv valve is stuck open, the backfire could carry into the crank case and ignite the crank case fumes. I have seen valve covers blown off an engine from this situation.
It should be towards the passenger side of the engine stuck in the valve cover.
Several things could make a carburetor backfire. The engine could be out of time. the carburetor could have a stuck float, or the engine could have a stuck valve.
It is on the left side of engine, but stuck in the intake manifold. That is you standing in the front of engine.
a stuck valve or bad plug or plug wire, or bad cap and rotor to include a cracked or missing vacum hose will make any engine miss.
Valve, valve spring, piston, piston ring, cylinder wall, head, headgasket, diluted oil, stuck injector,
the engine carbon cleaning service to remove these buildup.
A faulty or clogged egr valve can cause an engine to run rough. If stuck or clogged the valve can be cleaned after removal with carburetor cleaner.
The PCV valve is stuck in the valve cover on the passenger-side of the car. It just pulls up and out to change it.
you have a stuck valve