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I have Hijet Van, recently I did Engine Tuneup. They did only replace plugs,pressure injector and clean fuel tank filter. This is enough or not? is it not enough where the place for it and what is the cost.

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One of the main things of a fuel system clean up is the removal and cleaning of the throttle body. The throttle body gets accumulated with carbon deposits and needs to be carefully cleaned. The idle air control valve mounted onto the throttle body is usually taken out and cleaned as well. Was this not done? 

Some garages have a habit of spraying throttle body cleaner onto it while still mounted on the engine as it's easier. This is not always the right thing to do as the TPS and IACV are susceptible to damage when they come in contact with TB cleaner. 

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All important air filter?

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