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The objective of present study is to predict and analyze the flow through the Air Intake System (AIS) of a multicylinder S.I. engine by Computational Fluid Dynamics (CFD). The predicted results are validated by experimental data. Three-dimensional model of air intake system was created by using the commercially available software and the mesh was generated using the Tet-hybrid scheme. The pressure boundary conditions are used to define the fluid pressure at the inlet and outlet of the flow domain. Three different throttle conditions namely idling, 50% throttle opening and wide open throttling (WOT) are considered. Flow through the domain is analyzed for all the three cylinders. The CFD plots give informative pictures of the flow field, which will help the designer to understand the effect of various components of air intake system. The predicted airflow rate shows good agreement with the experimental results.