Great thread, I read all 700+ posts in one session :). I have a little problem and need your expert opinion. I am new to cars and bought 1996 model Mehran this month. Its engine is quite fine and I am happy with it. Problem is that it runs fine on CNG but when I switch it to patrol, its engine stops when ever i lift my foot from the gas paddle. It needs constant press of gas paddle and while running on patrol when I try to shift gear and lift my foot from excelerator, engine stops. I heard from some people that either CNG settings can be good or patrol, If i get it tuned from Patrol then CNG settings will be disturbed so I should not do it.
Now I want to ask you people that
1- Is it true if I get it tuned for patrol then it will loose CNG settings?
2- Can someone tell me from where to adjust the settings of CNG and Patrol? both have same place (like carburetor) or different for adjustment. A picture illustration will be highly appreciated.