Brother there is nothing wrong with any tuning. Just your automatic gear convertor has problem which is a common problem with automatic transmissions. Any problem with it's tuning or if it is on CNG would have effected it's performance by not more than 20 to 25%. But not climbing any height which mehrans do, is definitely a convertor issue. Nothing to do with auto/ manual, it should climb such heights in 2H gear. If there is problem in the convertor (gear), change the gear. The 660 transmission will not be more than 5 to 6000 Rs (kabli).