my car is shaking and wont run on petrol. just lpg

[zenna]

my car is shaking and wont run on petrol. just lpg. and on lpg it shakes like hell and a ugly smell comes out of the exhaust.
and a strong smell of petrol when i start the car.
when i run it on petrol now. it doesnt go. wants top cut out. wont go.
y y y could this b happening. could it be the injectors? as i dont run it on petrol.





oh, and i have a hard time starting my car. have to keep the key turned for upto 10 seconds before it starts.
thanx in advance for any info.

[GenReaper]

sounds like dirty injectors and leaking fueal by bleeding off the injectors overnight.