AoA! Car is cuore 2007. In the morning the car takes too much time to start on petrol. Such a problem is not there on CNG strangely. On petrol it starts only after being converted to neutral and that too after so many (Selfs). Have got it checked with so many mechanics but no one has figured out the real cause. what can be the reason? secondly, which ignition timing is appropriate on petrol, advance or retard? and why ?