I have a lexus is220d (2007), service and maintained from the main dealers. It has really bad lag below 2200 revs, to the extent it is difficult to drive on steep rds. It also jerks at low revs, once I accelerate over 2000 revs it drives quite normal. Fuel consumption is high, have cleaned the EGR valve and MAF sensor, run a number of cleaners through but sadly no progress. No lights showing on the managment side so please help!!