hi, im not 100 perc but on the evaporator there is a brass flat head type screw,depending on the set up,try turning this half a turn at a time,cant remember wich way but youll know, i set my ranger on my mates gas analiser and it made a difference, you could also replace the mixer on the throttle body for a bigger one so it lets more air/gas in, this makes quite a difference :D