i need advice

i just bought a 99 ex-cop crown vic, and im having some problems with her. she lags when i step on the gas like the fuel injectors arent working....i took it to get tuned-up and all and then she was running
fine and its kinda startin all over again. they replaced a few coils, sparkplugs which supposed to be related to the problem. anyway, i really want to get her running like she suppose to, wit some balls! does anyone know what might be the problem?
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I would check the fuel pressure.

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