My Altis 2009 had its Engine opened and lots of work done on it, New Valves. Cost me around 25K. The mileage was around 44K. I am really disapointed i previously drove Gli 2005 model and its head was opened after it did 150K and that cost me only 15K. I had a horrible month when it would stop working on gas while driving whenever i slowed down. Worked ok only on Petrol, but would stop on that aswell. I want to make sure i have 100K before i have to spend money on engine again. Please experts advise what to do. Do i need to get Lambda installed on it. It has Tomasetto CNG Kit Advancer, Emulator and Faber 55Kg cylinder