Hello, The last few days i'm having problems starting-up the car, as it starts the 5-cilinder engine seems to block, and if it tries to trottle it give's me an very worrying sound, although the second attempt usually is succesful. The lamba-sond indicator keeps on burning i've noticed, but once the engine runs, it looks to be running normally and driving the car is the same as before. The car is a 2.0litre Bi-fuel (LPG-fuel) model but this doesn't do anything about it, i've already tried that one out. What could be wrong ? Thanks, William
