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A Couple Things To Check
Have you checked the fuel filter? It may be clogged and this would restrict the flow of fuel to the injectors causing the engine to bog and buck.
Check the air filter and housing as your friend may have need of a new filter which might be restricting airflow and causing too rich a mixture.
And finally it may be the ignition module failing if the '99 has a distributor.
Hope this helps.
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