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It could also be the rear shoes and drums as well. Less common for them to go, but does happen. I would suggest taking it to your local repair shop to have them diagnose it though.
I had a P0300 multi misfire code, I changed the spark plugs, wire set, fuel filter, air filter and cleaned the throttle body and the code went away, but is still idling rough and stalling when I come to a stop sign. I checked the fuel pressure and that is running normal. I then checked the vacuum lines for leaks and found none. I am not sure where to turn next.