My car is not working smoothly pls help its urgent.

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Pls i have Honda accord here 1998 model, VTEC engine, it developed a fault. for like a week now it has not been working smoothly, it works like the plugs are bad then we changed the plugs but still the same, the cylinder 1 is not working well but if you bring out the plugs they are very clean and bright, then we scann the car and get this code p0141,please i need your help on how to repir and fix it up to work the way it should be. Thanks pls am waiting to hear from you.