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Hello and welcome to Just Answer, my name is***** you have a check engine light on and have you checked the codes if you do have one on?
If you start it on petrol, will it idle?
Have the basics been checked? I know it seems to run fine on petrol but have you checked spark plugs and the ignition boots on the plugs? Related to the fuel system, have you check the fuel filter. How is your fuel quality where you live, is it possible the fuel filter is plugged? Can you take a fuel sample to confirm there is no contamination?
Yes sorry I meant to type Propane instead of Petrol.
I would recommend a few things.
Take a fuel pressure reading.
Preform a cylinder balance test to try and identify if one specific cylinder is misfiring, now this will require the use of a computer that can read exact rpm. monitor the rpm as you remove one fuel injector connector at a time, the cylinder that has no effect on rpm, or the lowest effect on rpm is the suspected misfiring cylinder
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