This Preliminary Information communication provides information to the technician about vehicles with a flashing or solid malfunction indicator lamp with a misfire, rough idle, lack of performance, stall at idle after climbing and descending a mountain grade, low speed chuggle, or a cruise engagement bump has too much feel. Technician will find diagnostic trouble code of P0326 or P0331. Reprogram the engine control module and the transmission control module with the latest calibration.
