P0421 and Hesitation at low RPMs
 

Need help to figure out what to change first!

14000K miles.Sporadic hesitation/miss at low RPM (about 2000 RPM-more noticablewhen cold).

Trouble code indicates O2 sensors and/or catalytic converter. All are original.

Here is the data from the reader that lit the MIL:

DTC for which Freeze Frame was StoredP0421
Fuel System 1 StatusClosed Loop
Fuel System 2 StatusClosed Loop
Calculated LOAD Value38.82 %
Engine Coolant Temp195.80 °F
Short Term Fuel Trim - Bank 1-4.69 %
Long Term Fuel Trim - Bank 13.91 %
Short Term Fuel Trim - Bank 22.34 %
Long Term Fuel Trim - Bank 23.91 %
Engine RPM1866 rpm
Vehicle Speed Sensor38.53 mph

RE: P0421 and Hesitation at low RPMs
 

Oops... that's 140,000 miles... should have used preview!