Yes car is on cng. When car starts after giving problem then it runs fine without any problems. It give no problem at all except when it engine is switched of after driving for some time even short time 5-10 minutes. Otherwise it drives fine.
It was suggested by @Xulfiqar it can be bad crank sensor problem.
Very confused now.
Starter motor we serviced two times. One time when we get the car and second time when we start getting this problem.
Also battery terminals etc have been checked.
Get the valve clearance checked and loosen the tappets slightly.
Not done this but car not heating up. Problem start even on normal operating temprature like when needle is under half point or at half point.
Doing that on monday.
Please any if you can help. I am very thankful already for suggestions.