nice clean left hand Dubai car.
complex problem as figuring out which one thing had gone bad out of 100 possiblities. In my opinion it could be bad spark plugs, clog air filter etc.
i am quoting below from i-dsi manual
i-DSI System
The ECM controls the ignition phase gap between the front and rear spark plugs in accordance with the engine speed and the vacuum in the intake manifold.
- At idling, both the front and rear spark plugs ignite simultaneously for faster combustion speed and the resulting improvement of the fuel consumption.
- At low speed with low load operation, the ECM advances the ignition timing at the front side spark plug, where the combustion chamber temperature is relatively low, to improve the fuel consumption.
- At low speed with high load operation, ignition timing is advanced at the front side spark plug and it is retarded at the rear side to improve torque while controlling the engine knocking.
- At high speed, both the front and rear spark plugs ignite simultaneously for faster combustion speed and the resulting improvement of the power.
wait for some expert opinion.