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it's unusual for the cel light (engine check light) not to come on with a fault like this. are all the obvious things o/k? (plugs, wires, filtres etc) the other thing l can think off is the air flow meter (this can cause problems without turning on the cel light) l know you may well be hard up but this problem really needs to be sorted by checking the vehicle on the hyundai scanner. l believe that in the u.s. autozone will do this for free.if the scanner does not throw up any codes l would try the air flow meter first.
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