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...little rough.? Also, in park, at 3800 rpm's it really seems to misfire.

The car idles very rough and is sometimes unresponsive when the gas pedal is pushed. I am getting a P0155 and 1152 code when this happens. I have changed the pcv valve and the air filter. scan says p1152 lack of ho2s21 switch sensor indicator rich and p0155 upstream heated O2 censor heater...