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Help I have replaced the cat converter, upstream and downstream 02 sensors, air filter, ign coils and spark plugs, MAF sensor, replaced intake manifold gasket, cleaned the throttle body, checked for vac leaks (none), replaced the gas cap on my 2001 Corolla. I have no more random misfire codes...

I have a 2001 Toyota Corolla and have replaced the upstream and downstream oxygen sensors, cat converter, coils and spark plugs, intake manifold gasket, air filter, MAF sensor and even the gas cap. I no longer have any random misfire codes but still have a P0171 code. I am wits end as to what to...