P304 codes keep cutting off

Swap a coil pack with the number 4 cylinder and clear codes to see if they return.

code p304- missfire cyl 4 - check sparkplug, wire/coil ,replace if bad.

Change...distributor cap ..spark plug wires or spark plugs

P0300, Multiple Cylinder Mis-fire
P0304 #4 cylinder misfire
do the compresion test on all cilinders. check wiring on injectors....
Marko

I don't think it is your catalytic converter because your light usually flashes and a bad cat I never heard of them causing a misfire. I ran your other code it is for a faulty EGR system. Exhaust gas recirculation excessive. You are getting too much exhaust gas back in the system. This will cause your misfire. Go-to a trusted mechanic and have them check out your EGR system.

CLEAN FUEL INJECTORS SEE IF THAT HELPS.IF NOT COULD HAVE BAD FUEL INJECTOR OR FUEL INJECTOR ELECTRICAL CONNECTOR COULD HAVE A SHORT.DO A COMPRESSION CHECK ON THAT CYLINER COULD ALSO HAVE LOW COMPRESSION DUE TO BAD VALVES OR INTAKE MANIFOLD LEAK AT CYLINDER NUMBER 4.

MISFIRE CAN BE CAUSED BY DIRTY CLOGGED FUEL INJECTORS.CLEAN FUEL INJECTORS.SEE WHAT HAPPENS

mis fire cylinder for check plugs wires and other firing componints also if its coil packs check the coils

you are having missfiring problems. You need a tune up coil, wires and plugs.