14-01-14, 06:28 PM
Start by checking ALL the pipes are still attached and not split, then move up to clean all multiplug connectors with a proper terminal clean/lube aerosol spray. Depending on mileage and how well its been serviced, the next place to look is the throttle butterfly housing which will prob need a good clean, you need to jam the throttle on full ( obviously without the engine running) to able to clean out all the crap which accumulates where the butterfly closes. ONLY use cleaning products that are "air" safe, ie WD40 , other products look like they are ok but will damage your Lambda / Oxygen sensor. Unless your Alto has done a lot of miles its unlikely to be any of the sensors, they are incredibly tough bits of kit to break.
Old enough to know better