Is your engine warning light on?
Could be one of a long list of things:
-Clogged fuel filter
-Failing injector(s)
-Top dead centre sensor
-Manifold Absolute Pressure (MAP) sensor - this measures the pressure in your inlet manifold and tells the ECU when the engine is under load so it can adjust timing and fuel mixture; could be a leak in the inlet manifold area / vacuum.
-Lambda / Oxygen sensor - measures the amount of oxygen in the exhaust gases. They can get clogged and incorrectly tell the ECU to enrich the mixture.
-Coolant temperature sensor; see:
http://www.saxperience.com/forum/sho...d.php?t=195050
-Slipping clutch friction plate
Cheers
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